KR101294537B1 - Communication device and method for power saving - Google Patents

Abstract

Communication devices and methods are disclosed. The communication device transmits and receives data with neighbor communication devices based on a routing protocol, maintains a forwarding table storing forwarding information of the data, and uses the forwarding table to transfer to a first communication device of the neighbor communication devices. The data transmission stop may be determined, and power saving information may be transmitted to the first communication device.

Power Save, Routing Protocol, Communication Device, Switch, Router

Description

COMMUNICATION DEVICE AND METHOD FOR POWER SAVING}

The present invention relates to a communication apparatus and method, and more particularly, to a communication apparatus and method using information of a forwarding table for power saving.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Telecommunication Research and Development. Development]

Internet routing is determined based on information of the Interior Gateway Protocol (IGP) metric or TE metric. At this time, such information is exchanged based on the routing protocol. Also, the router determines one of several next hops based on information obtained from neighboring routers to configure a forwarding table. Therefore, the router cannot determine whether the route to a specific destination device is included in the forwarding table by referring to its own forwarding table.

On the other hand, in order to secure the capacity required for network design, communication devices, ports, and lines are often installed redundantly. In this situation, network administrators can consider reducing power consumption by temporarily shutting down or putting some devices into a low power state during off-peak hours other than during peak hours of the day.

However, routing may not know if it is included in the routing path, and may cause a break in communication due to an interruption or power saving state transition.

One embodiment of the present invention provides a communication apparatus and method for controlling power usage without disconnection by controlling a power saving mode entry using a forwarding table of neighboring communication apparatuses.

Embodiments of the present invention provide a communication apparatus and method for more stably improving power efficiency by transmitting and receiving power saving information on a forwarding table and operating a power saving mode through control of a transmission port and a receiving function.

According to an embodiment of the present invention, a communication device includes a routing unit for transmitting and receiving data with neighbor communication devices based on a routing protocol, a forwarding table for storing forwarding information of the data, and the neighboring communication devices using the forwarding table. And a power saving information exchange unit which determines to stop data transmission to the first communication device and transmits power saving information to the first communication device.

According to one aspect of the present invention, the power saving information exchange unit detects a change of the forwarding information, and if the change is associated with the first communication device, determines the data transmission stop.

Further, according to one aspect of the present invention, when the change is deletion associated with the first communication device, the power saving information exchange unit transmits the power saving information according to the presence or absence of forwarding information for the first communication device, At this time, the power saving information is in the middle of transmission.

According to one aspect of the present invention, the power saving information exchange unit includes a non-transmission notification database, and records the transmission result of the transmission stop information in the non-transmission notification database.

According to one aspect of the present invention, the power saving information exchange unit transmits the power saving information according to a transmission result of the transmission stop information for the first communication device when the change is an addition associated with the first communication device, At this time, the power saving information is transmission resume information.

According to one aspect of the present invention, when the change is an update associated with the first communication device, the power saving information exchange unit transmits the power saving information according to a transmission result of the transmission stop information for the first communication device, At this time, the power saving information is any one of transmission stop information and transmission resume information.

In addition, according to one side of the present invention, the power saving information may be transmitted using the routing protocol.

In addition, according to one aspect of the invention, the communication device further includes a control unit for controlling the transmission port associated with the first communication device in response to the transmission of the power saving information.

In addition, according to one aspect of the invention, the communication device further includes a control unit for controlling the power saving mode in response to power saving information received from at least one of the neighbor communication devices.

In addition, according to an aspect of the present invention, the control unit includes a transmission stop database, when the received power saving information is transmission stop information, enters the power saving mode by using the transmission stop database, and the received When the power saving information is transmission resume information, the power saving mode is released using the transmission stop database.

In addition, according to one side of the present invention, the control unit controls the reception function in response to power saving information received from at least one of the neighbor communication devices.

In addition, according to one side of the invention, the control unit for controlling the power saving mode in response to the command input from the operator further.

In addition, according to one aspect of the present invention, the control unit requests the data transmission stop to the neighbor communication devices in response to the command, and controls the power saving mode in response to the request.

In addition, the communication apparatus according to an embodiment of the present invention is a routing unit for transmitting and receiving data with neighbor communication devices based on a routing protocol, power saving information exchange unit for receiving power saving information from a first communication device of the neighbor communication devices And a control unit controlling a power saving mode in response to the power saving information, wherein the first communication device determines the data transmission stop by using a forwarding table and generates the power saving information.

One embodiment of the present invention can provide a communication device and a method that can control power usage without disconnection by controlling the entry of a power saving mode using a forwarding table of neighbor communication devices.

One embodiment of the present invention provides a communication device and method that can more efficiently improve the efficiency of power usage by transmitting and receiving power saving information on a forwarding table and operating a power saving mode through control of a transmission port and a receiving function. can do.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and accompanying drawings, but the present invention is not limited to or limited by the embodiments.

1 is a view showing a relationship structure between communication devices according to an embodiment of the present invention.

When a traffic introduced through communication device A shown in FIG. 1 needs to be transmitted to another location through communication device E, there are various paths from communication device A to communication device E. This is to secure a separate bypass path in preparation for a failure or to prevent lack of communication devices or line capacity.

Meanwhile, assuming that communication device C of FIG. 1 is used only as a core device for transmission without being directly connected to an external device or terminal, two or more paths can be selected among all communication devices except for communication device C. Therefore, there may be a time during the day that does not require operation of the C communication device unless there is a specific reason for lack of capacity. In other words, the C communication device may be installed for the purpose of increasing the network transmission capacity. In this context, the dual line between the communication devices A-B and C-E may also be for improving transmission capacity.

Therefore, the C communication device can reduce power consumption by operating in an idle mode or a power saving mode during a time when there is little transmission. In this context, the A, B, C, and E communication devices can save power consumption for transmission by using only one of the two lines according to the power saving mode switching. In this case, an example of the A communication device to the E communication device may include a switch or a router.

The C communication device uses forwarding table information of neighbor communication devices to initiate the power saving mode. In addition, the forwarding table information may be obtained through power saving information received from the neighboring communication devices. For example, when there is no transmission plan to the C communication device in the forwarding table of all the A, B, D, and E communication devices of FIG. 1, the C communication device saves power saving information received from the A, B, D, and E communication devices. This can be determined by using them, and the power saving mode of the whole equipment can be started. In addition, the C communication device may determine whether there is only traffic temporarily from the neighbor communication devices to the C communication device by using the power saving information, or whether there is no routing from the neighbor communication devices to the C communication device. .

In addition, each of the A to E communication devices using a routing unit for transmitting and receiving data for exchanging routing information with neighbor communication devices based on a routing protocol, a forwarding table for storing the forwarding information of the data, and the forwarding table. The apparatus may include a power saving information exchange unit configured to determine data transmission to the first communication device among neighboring communication devices and to transmit power saving information to the first communication device.

The operation of such a communication device will be described in more detail later with reference to FIGS. 2 to 8.

2 is a block diagram illustrating a communication device according to an embodiment of the present invention.

As shown in FIG. 2, the communication device 200 includes a routing unit 201, a forwarding table 202, a power saving information exchange unit 203, and a control unit 204.

The routing unit 201 transmits and receives data with neighboring communication devices based on a routing protocol. In this case, one example of the neighbor communication devices may include a router and a switch connected to the communication device 200.

The forwarding table 202 stores forwarding information of the data. In detail, the routing unit 201 adds, deletes, or updates a forwarding table while exchanging data with neighboring communication devices based on a routing protocol.

The power saving information exchanger 203 determines to stop data transmission to the first communication device among the neighboring communication devices by using the forwarding table, and transmits power saving information to the first communication device.

Specifically, the power saving information exchange unit 203 continuously audits the forwarding table 202, and if the item using the specific communication device is not present in the forwarding table, the power saving information exchanger 203 notifies the specific communication device to the specific communication device. Allows explicit knowledge that there is no traffic transmission. At this time, the specific communication device is the first communication device. In addition, the transmission of power saving information may be performed based on a unique protocol or may be performed based on the routing protocol. That is, according to an embodiment of the present invention, the power saving information may be transmitted using the routing protocol.

In addition, the power saving information exchange unit 203 may detect a change in the forwarding information, and determine that the data transmission stops when the change is associated with the first communication device. In this case, the change may include adding, updating, and deleting the forwarding information.

For example, when determining that the change of the forwarding information is deletion associated with the first communication device, the power saving information exchange unit 203 may transmit the transmission stop information as the power saving information to the first communication device. On the other hand, when determining that the change is an addition associated with the first communication device, the power saving information exchange unit 203 may transmit transmission resume information as power saving information to the first communication device. In addition, when the change is an update, the power saving information exchange unit 203 may transmit the transmission stop information or the transmission resume information to the first communication device according to either the deletion or the addition.

The controller 204 controls the power saving mode in response to power saving information received from at least one of the neighboring communication devices. For example, when receiving power saving information from the neighboring communication devices, the controller 204 determines that there is no traffic destined for itself based on the power saving information, and enters a power saving mode.

3 is a flowchart illustrating a communication method according to an embodiment of the present invention.

As shown in FIG. 3, the communication method may be performed in steps S301 to S312. In addition, the steps S301 to S312 may be performed by the power saving information exchange unit 203.

In operation S301, the power saving information exchanger 203 detects a change of the forwarding information in the forwarding table 202. Thereafter, the power saving information exchange unit 203 determines whether the change of the forwarding information is one of deletion, addition or update (S302).

When the forwarding information is deleted, the power saving information exchange unit 203 identifies that the deletion is associated with the first communication device (S303), and when the deletion is associated with the first communication device, the data is transmitted to the first communication device. After checking whether a state in which no entry is transmitted occurs has occurred (S304), if no entry is transmitted through the first communication device, transmission stop information is transmitted to the first communication device as the power saving information (S304). S305). That is, the power saving information exchanger 203 may determine whether the forwarding information for the first communication device exists and transmit the transmission stop information when the forwarding information for the first communication device does not exist. have. On the other hand, the power saving information exchange unit 203 terminates the procedure when forwarding information for the first communication device exists.

Further, in step S306, the power saving information exchange unit 203 records in the non-transmission notification database that the transmission stop information has been transmitted to the first communication device, and ends the procedure.

On the other hand, when the forwarding information is added, the power saving information exchange unit 203 identifies that the deletion is associated with the first communication device (S307), and when the addition is associated with the first communication device, the non-transmission notification database is added. In operation S308, it is determined whether transmission stop information has been previously transmitted to the first communication device. If it is determined that a new entry is made in the first communication device to which the transmission stop information has been previously transmitted, the power saving information exchanger 203 transmits transmission resume information as power saving information to the first communication device (S309). On the other hand, the power saving information exchange unit 203 terminates the procedure if the transmission stop information has not been transmitted.

Further, in step S310, the power saving information exchange unit 203 records in the non-transmission notification database that the transmission resume information has been transmitted to the first communication device, and ends the procedure. At this time, the power saving information exchange unit 203 may delete the first communication device from the non-transmission notification database.

On the other hand, when the forwarding information is updated, the power saving information exchange unit 203 identifies that the update is associated with the first communication device (S311), and when the update is associated with the first communication device, generates a non-transmission notification database. In operation S312, it is determined whether transmission stop information has been previously transmitted to the first communication device. The power saving information exchanger 203 may perform step S309 when the transmission stop information is previously transmitted, and may perform step S303 when not previously transmitted. That is, when it is determined that the change is an update, the power saving information exchange unit 203 may proceed with a procedure corresponding to deletion or addition.

Also, although not shown in FIG. 3, according to an embodiment of the present invention, the controller 204 controls a transmission port associated with the first communication device in response to the power saving information transmission. In detail, in operation S305, when the transmission stop information is transmitted to the first communication device, the controller 204 may enter a transmission port associated with the first communication device into a power saving mode. In contrast, in step S309, when the transmission resume information is transmitted to the first communication device, the control unit 204 may switch the transmission port associated with the first communication device from the power saving mode to the normal mode.

4 is a flowchart illustrating a communication method according to an embodiment of the present invention.

As shown in FIG. 4, the communication method may be performed in steps S401 to S403. In this case, steps S401 to S403 may be performed by the controller 204.

In step S401, the control unit 204 receives transmission stop information from at least one of the neighbor communication devices. Specifically, when receiving the power saving information from the at least one communication device, the control unit 204 identifies whether the power saving information is transmission stop information.

In step S402, the controller 204 determines whether the transmission stop information has been received from all of the neighboring communication devices. In detail, when the power saving information is transmission stop information, the controller 204 records the information in the transmission stop database and determines whether the transmission stop information has been received from all of the neighboring communication devices based on the transmission stop database. .

In step S403, when the control unit 204 receives the transmission stop information from all of the neighboring communication devices, the controller 204 enters a power saving mode.

That is, since the power saving mode is enabled in units of communication devices, the control unit 204 may switch the communication device 200 to the power saving mode only after receiving transmission stop information from all neighboring communication devices. In addition, when the control unit 204 receives the transmission resumption information from any one of the neighbor communication devices in the power saving mode, the controller 204 switches to the normal mode.

On the other hand, if the control unit 204 does not receive the transmission stop information from all of the neighbor communication devices as a result of the determination, the procedure ends.

In addition, the power saving mode may include modes for lowering power consumption or increasing power efficiency, such as an idle mode and a power limit mode.

In addition, although not shown in FIG. 4, according to an embodiment of the present disclosure, the controller 204 may control a reception function in response to power saving information received from at least one of the neighboring communication devices. In detail, in operation S401, when the received power saving information is transmission stop information, the controller 204 may switch the reception function associated with the at least one communication device to the power saving mode.

5 is a flowchart illustrating a communication method according to an embodiment of the present invention.

As shown in FIG. 5, the communication method may be performed in steps S501 to S503. In this case, steps S501 to S503 may be performed by the controller 204.

In step S501, the control unit 204 receives transmission resumption information from at least one of the neighboring communication devices. Specifically, when receiving power saving information from the at least one communication device, the control unit 204 identifies whether the power saving information is power saving resume information.

In step S502, the controller 204 determines whether the communication device 200 enters a power saving mode. Specifically, when the power saving information is transmission resumption information, the control unit 204 deletes the transmission stop information reception history associated with the at least one communication device in the transmission stop database, and the communication device 200 enters the power saving mode. Determine whether or not.

In step S503, the control unit 204 releases the power saving mode when the communication device 200 enters the power saving mode as a result of the determination. On the contrary, if the communication device 200 is not in the power saving mode, the controller 204 ends the procedure. That is, when the control unit 204 receives the transmission resumption information from any one of the neighboring communication devices in the power saving mode of the communication device 200, the control unit 204 switches to the normal mode.

In addition, although not shown in FIG. 5, according to an embodiment of the present disclosure, the controller 204 may control a reception function in response to power saving information received from at least one of the neighboring communication devices. In detail, in operation S501, when the received power saving information is transmission resumption information, the controller 204 may switch the reception function associated with the at least one communication device from the power saving mode to the normal mode.

In addition, as shown in FIG. 2, the communication device 200 may be controlled from a management system. In addition, one example of such a management system may include an operator device. Therefore, according to an embodiment of the present invention, the control unit 204 may control the power saving mode in response to a command input from the operator.

In detail, the controller 204 may request to stop data transmission to the neighboring communication devices in response to the command, and control the power saving mode according to the response of the request.

In other words, when the power saving mode is instructed from the management system among the communication devices, the routing information exchange for the power saving mode and the power saving mode transition are automatically performed. For example, when a power saving mode command is input to the communication device 200, the control unit 204 transmits a data transmission stop request notifying the neighboring communication devices of entering the power saving mode, and then enters the power saving mode. In this case, the request for notifying the power saving mode entry may be performed by a routing protocol or through a protocol for transmitting and receiving power saving information.

In contrast, when a command for returning from the power saving mode to the normal mode is input to the communication device 200, the control unit 204 transmits a data transmission resumption request notifying the neighboring communication devices of returning to the normal mode, and then the normal mode. Enter

Meanwhile, when the communication device 200 receives a data transmission stop request from a specific communication device among neighboring communication devices, the communication device 200 changes the forwarding information associated with the specific communication device in the forwarding table. In this case, the specific communication device may be a second communication device.

For example, when the communication device 200 receives a data transmission stop request from a second communication device among neighboring communication devices, the communication device 200 changes or deletes the information going to the second communication device from the forwarding table 202 and the second communication device. 2 may respond to the second communication device after switching the port associated with the communication device to the power saving mode. In contrast, when the communication device 200 receives a data transmission resumption request from a second communication device among neighboring communication devices, the communication device 200 changes or adds information to the second communication device in the forwarding table 202 and the first communication device. 2 The port associated with the communication device may respond to the second communication device after returning from the power saving mode to the normal mode.

6 is a block diagram illustrating a communication device according to an embodiment of the present invention.

As shown in FIG. 6, the communication device 600 may include a routing unit 601, a power saving information exchange unit 602, and a control unit 603.

The routing unit 601 transmits and receives data with neighboring communication devices based on a routing protocol.

The power saving information exchange unit 602 receives power saving information from the first communication device among the neighboring communication devices. At this time, the first communication device determines the data transmission stop using the forwarding table, and generates the power saving information.

The controller 603 controls the power saving mode in response to the power saving information.

Specifically, the control unit 603 includes a transmission stop database, and when the received power saving information is transmission stop information, the control unit 603 enters the power saving mode by using the transmission stop database. On the other hand, when the received power saving information is transmission resumption information, the control unit 603 performs the switching from the power saving mode to the normal mode by using the transmission stop database.

In addition, according to an embodiment of the present invention, the control unit 603 controls the reception function in response to power saving information received from at least one of the neighbor communication devices. In addition, according to an embodiment of the present invention, the control unit 603 controls the power saving mode in response to a command input from an operator.

In addition, the configuration of the control unit 603 is the same as the configuration of the control unit 204 described above with reference to FIGS. 4 and 5, or those skilled in the art can be easily inferred from the described configuration and will not be described below. In addition, matters not described with respect to the communication device 600 of FIG. 6 may be easily inferred from the contents described with reference to FIGS. 1 to 5 described above.

7 is a flowchart illustrating a communication method according to an embodiment of the present invention.

As shown in FIG. 7, the communication method may be performed in steps S701 to S704. In addition, step S701 is performed by the routing unit 201, step S702 by the forwarding table 202, step S703 by the power saving information exchange unit 203, and step S704 by the controller 204, respectively. Can be.

In operation S701, the routing unit 201 transmits and receives data with neighbor communication devices based on a routing protocol. In this case, one example of the neighbor communication devices may include a router and a switch connected to the communication device 200.

In step S702, the forwarding table 202 stores forwarding information of the data. In detail, the routing unit 201 adds, deletes, or updates a forwarding table while exchanging data with neighboring communication devices based on a routing protocol.

In step S703, the power saving information exchange unit 203 determines that data transmission is stopped to a first communication device among the neighboring communication devices by using the forwarding table, and transmits power saving information to the first communication device.

Specifically, the power saving information exchange unit 203 continuously audits the forwarding table 202, and if the item using the specific communication device is not present in the forwarding table, the power saving information exchanger 203 notifies the specific communication device to the specific communication device. Allows explicit knowledge that there is no traffic transmission. At this time, the specific communication device is the first communication device. In addition, the transmission of power saving information may be performed based on a unique protocol or may be performed based on the routing protocol. That is, according to an embodiment of the present invention, the power saving information may be transmitted using the routing protocol.

In step S704, the control unit 204 controls the power saving mode in response to power saving information received from at least one of the neighboring communication devices. For example, when receiving power saving information from the neighboring communication devices, the controller 204 determines that there is no traffic destined for itself based on the power saving information, and enters a power saving mode.

In addition, the matters that are not described with respect to the above steps (S701) to (S704) can be easily inferred by those skilled in the art from the same or as described above with reference to FIGS. 1 to 7 will be omitted. do.

8 is a flowchart illustrating a communication method according to an embodiment of the present invention.

As shown in FIG. 8, the communication method may be performed in steps S801 to S803. In addition, step S801 may be performed by the routing unit 601, step S802 by the power saving information exchange unit 602, and step S803 by the controller 603.

In step S801, the routing unit 601 transmits and receives data with neighboring communication devices based on a routing protocol.

In operation S802, the power saving information exchange unit 602 receives power saving information from a first communication device among the neighboring communication devices. At this time, the first communication device determines the data transmission stop using the forwarding table, and generates the power saving information.

In step S803, the control unit 603 controls the power saving mode in response to the power saving information.

Specifically, the control unit 603 includes a transmission stop database, and when the received power saving information is transmission stop information, the control unit 603 enters the power saving mode by using the transmission stop database. On the other hand, when the received power saving information is transmission resumption information, the control unit 603 performs the switching from the power saving mode to the normal mode by using the transmission stop database.

In addition, according to an embodiment of the present invention, the control unit 603 controls the reception function in response to power saving information received from at least one of the neighbor communication devices. In addition, according to an embodiment of the present invention, the control unit 603 controls the power saving mode in response to a command input from an operator.

In addition, the matters that are not described with respect to steps S801 to S803 may be easily inferred by those skilled in the art from the same or as described above with reference to FIGS. 1 to 7, and the descriptions thereof will be omitted. do.

In addition, the above-described functional blocks and methods are not limited to be configured in the communication device, and in the case of legacy equipment, the functions may be performed in conjunction with an external server. In addition, for convenience of description, the state of the equipment or port indicated as a normal mode, a power saving mode, an idle mode, etc. may have a multi-step mode including various steps such as a standby mode, a power saving mode, and a power stop mode.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

1 is a view showing a relationship structure between communication devices according to an embodiment of the present invention.

2 is a block diagram illustrating a communication device according to an embodiment of the present invention.

3 is a flowchart illustrating a communication method according to an embodiment of the present invention.

4 is a flowchart illustrating a communication method according to an embodiment of the present invention.

5 is a flowchart illustrating a communication method according to an embodiment of the present invention.

6 is a block diagram illustrating a communication device according to an embodiment of the present invention.

7 is a flowchart illustrating a communication method according to an embodiment of the present invention.

8 is a flowchart illustrating a communication method according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

200: communication device

203: power saving information exchange unit

204: control unit

Claims (20)

A routing unit for transmitting and receiving data with neighboring communication devices based on a routing protocol; A forwarding table for storing forwarding information of the data; And A power saving information exchange unit which determines to stop data transmission to a first communication device among the neighboring communication devices by using the forwarding table and transmits power saving information to the first communication device; Including, The forwarding table is, And change a forwarding information associated with the second communication device when a data transmission stop request is received from a second communication device among the neighboring communication devices. The method of claim 1, The power saving information exchange unit, Detect a change in the forwarding information and determine that the data transmission stops when the change is associated with the first communication device. 3. The method of claim 2, The power saving information exchange unit, If the change is a deletion associated with the first communication device, transmit the power saving information according to whether there is forwarding information for the first communication device, The power saving information is, Communication device that sets the transmission stop information. The method of claim 3, The power saving information exchange unit, Includes a non-delivery notification database, And the transmission result of the transmission stop information is recorded in the non-transmission notification database. The method of claim 3, The power saving information exchange unit, If the change is an addition associated with the first communication device, transmit the power saving information according to a transmission result of the transmission stop information for the first communication device, The power saving information is, Communication device characterized in that the transmission resume information. The method of claim 3, The power saving information exchange unit, If the change is an update associated with the first communication device, transmit the power saving information according to a transmission result of the transmission stop information for the first communication device, The power saving information is, A communication device, characterized in that any one of the transmission stop information and transmission resume information. 3. The method of claim 2, The above change, And any one of addition, update, and deletion of the forwarding information. The method of claim 1, The power saving information is, And transmit using the routing protocol. The method of claim 1, A control unit controlling a transmission port associated with the first communication device in response to the power saving information transmission Communication device comprising a further. The method of claim 1, A control unit controlling a power saving mode in response to power saving information received from at least one of the neighboring communication devices Communication device comprising a further. The method of claim 10, The control unit, Include a stop database, And when the received power saving information is transmission stop information, entering the power saving mode by using the transmission stop database. 12. The method of claim 11, The control unit, And when the received power saving information is transmission resumption information, canceling the power saving mode by using the transmission stop database. The method of claim 10, The control unit, And controlling a reception function in response to power saving information received from at least one of the neighboring communication devices. The method of claim 1, Control unit for controlling the power saving mode in response to a command input from the operator Communication device comprising a further. The method of claim 14, The control unit, And requesting to stop data transmission to the neighboring communication devices in response to the command, and controlling the power saving mode in response to receiving the response. delete A routing unit for transmitting and receiving data with neighboring communication devices based on a routing protocol; A power saving information exchange unit which receives power saving information from a first communication device among the neighboring communication devices; And A control unit controlling a power saving mode in response to the power saving information Including, The first communication device, Determine a data transmission stop using a forwarding table, generate the power saving information, The control unit, Include a stop database, And when the received power saving information is transmission stop information, entering the power saving mode by using the transmission stop database. delete 18. The method of claim 17, The control unit, And controlling a reception function in response to power saving information received from at least one of the neighboring communication devices. 18. The method of claim 17, The control unit, And controlling the power saving mode in response to a command input from an operator.

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