KR20130004848A - System, client device, and method for keep-alive communication - Google Patents

Abstract

PURPOSE: A keep-alive communication system, a client, and a communication method are provided to notice whether transmission of a keep-alive message is successful or not by transmitting a reply request keep-alive message which requests a reply to a server. CONSTITUTION: A reply request keep-alive transmission module(110) transmits a reply request keep-alive message to a server. A reply non-request keep-alive transmission module(120) transmits a reply non-request keep-alive message to the server. A reply reception module(150) receives a reply message from the server. A keep-alive frequency adjustment module(130) adjusts a keep-alive frequency according to reception of the reply message according to transmission of the reply request keep-alive message. [Reference numerals] (100) Client; (110) Reply request keepalive transmission module; (120) Replay non-request keepalive transmission module; (130) Keepalive frequency adjustment module; (150) Reply reception module

Description

KeepAlive Communication System, Client, and Method {System, client device, and method for keep-alive communication}

The present invention relates to a keepalive communication system, a client, and a communication method, and more particularly, excessive traffic generation due to a keepalive message by optimizing a transmission period of a keepalive message adaptively according to a situation of a communication network to which a client is connected. And a keep-alive communication system, a client, and a communication method capable of reducing power consumption and reducing power consumption of a client terminal due to frequent keep-alive message transmission.

In a communication system in which a messenger service server continuously recognizes an online state of each client and notifies another client, such as a messenger application installed and used in a client terminal such as a smartphone, the client continuously reports its online state to the server. If the server has not communicated with the server for a certain period of time, the server manages the state offline. The client maintains its online state by periodically sending a keep-alive message to the server even when entering the idle mode (the client terminal enters the low power mode because there is no user input for a certain time). Should be.

In such a keep-alive communication system, as the number of clients increases, the keep-alive message transmitted through the communication channel also increases, which may cause an overload of the communication network. In addition, as the keepalive period T _K , which is a transmission period of the keepalive message, is shorter, the number of keepalive messages per hour increases. In addition, the shorter the keep-alive period (T _K ), the more frequently the operation for transmitting the keep-alive message of the client terminal has a problem that the power consumption of the client terminal also increases.

Meanwhile, the server of the keep-alive communication system considers the client to be in an offline state when there is no message transmission and reception for a predetermined time with the client identified as online. Therefore, by setting the keep-alive period (T _K ) to the server's allowable time (T _S ), which is the maximum allowable time of the server that keeps the client online, the total number of keep-alive messages can be reduced and the power consumption of the client terminal is minimized. You can.

However, network devices such as firewalls and network address translation (NAT) constituting a communication network are often set to forcibly terminate a connection of a client without data transmission for a predetermined time in order to efficiently use network resources. If the keep-alive period (T _K ) is set above the maximum allowable time (T _D ) of the network device that maintains the client's connection, the connection with the client's network is terminated at every keep-alive period. There is a problem that it is difficult to send an alive message.

For example, suppose that the client 100 accesses the server 200 having a server allowable time T _S of 300 seconds through the communication path 1, the communication path 2, and the communication path 3, as shown in FIG. In the case of route 1, since the equipment allowable time T _D of the network device 311 intervening in the middle is 350 seconds or more than the server allowable time T _S , the keep-alive period T _K is set to the server allowable time T _S. 300 seconds, or considering the transmission delay, it can be set slightly below the server allowed time (T _S ).

However, if there are network devices (322,331) whose equipment allowable time (T _D ) is less than the server allowable time (T _S ), such as communication path 2 and communication path 3, the keep-alive period is 300 seconds, which is the server allowable time (T _S ). If (T _K ) is set, a problem arises in that the network connection of the client 100 is released by the network equipment 322, 331 every cycle.

In particular, in the case of the mobile client 100, which is guaranteed mobility, the communication path changes from time to time according to the access location, and accordingly, the equipment allowable time (T _D ) of the network equipment existing on the communication path is also varied, thus keeping the server-client stable. For alive communication, a keep-alive period T _K should be set based on a device allowance time T _D of a network device having the shortest device allowance time T _D among network devices on a communication path.

Therefore, in the conventional keep-alive communication system using a fixed keep-alive period (T _K ), in order to design stable keep-alive communication in all cases, it has the smallest equipment allowable time (T _D ) among all available communication paths. The keep-alive period T _K should be set based on the equipment allowable time T _D of the network equipment. In FIG. 5, the device allowable time T _D of the network device 322 of communication path 2 is 100 seconds. Alternatively, it may be possible to perform stable keep-alive communication only in a case where it is set to a keep-alive period (T _K ) that is slightly less than 100 seconds. As a result, even when longer keep-alive periods T _K such as communication paths 1 and 3 can be set, there is a problem in that network load increases and power consumption of the client terminal increases due to unnecessary frequent keep-alive message transmission.

The present invention is to solve the above problems, the keep-alive communication system, the client and the communication method according to the present invention, unnecessarily frequent keep-alive by finding and determining the optimal keep-alive period in the communication path currently connected to the client It aims to prevent network overload caused by message transmission and to reduce power consumption of client terminals.

In the keep-alive communication system, the client, and the communication method according to an embodiment of the present invention, in the keep-alive communication using UDP / IP, which is a protocol that cannot confirm whether a message is normally delivered, a request for a keep-alive message is requested. It is another object of the present invention to determine an optimal keepalive period through a method of determining whether the keepalive message is normally delivered.

In a keep-alive communication system, a client, and a communication method according to another embodiment of the present invention, when a client accesses a mobile communication-based data communication network provided by a mobile communication network operator, communication devices of the mobile communication-based data communication network may send a keep-alive message. By adjusting the keep-alive period to the data network equipment allowable time, which is the maximum time to maintain the client's network connection without sending any messages, including the other, reducing the time required to search for the optimal keep-alive period for mobile-based data network connection. The purpose.

The keep-alive communication system according to the present invention comprises a client for transmitting a keep-alive message through a UDP / IP protocol; And a server that keeps the client online according to receipt of the keepalive message from the client, wherein the client is a keepalive message requesting a reply message from the server. A reply request keepalive transmission module for sending a request keepalive message; An unsolicited keep-alive transmission module for transmitting an unsolicited keep-alive message that is a keep-alive message that does not request the reply message to the server; A reply receiving module for receiving the reply message from the server; And a keep-alive period adjustment module for adjusting a keep-alive period, which is a transmission period of the keep-alive message, according to whether or not the reply message has been received according to the transmission of the reply request keepalive message. And a keep-alive receiving module for receiving the message and a reply-transfer module for transmitting the reply message to the client when receiving the reply request keep-alive message.

In a keep-alive communication system according to an embodiment of the present invention, a range of server allowable time, which is the maximum allowable time for the keep-alive period adjusting module to keep the client online without receiving a message including a keep-alive message, is a range of server allowable time. It characterized in that for adjusting the keep-alive period.

In a keep-alive communication system according to an embodiment of the present invention, the reply-receiving module sends the reply message from the server in response to the keep-alive period adjusting module transmitting the reply request keep-alive message from the reply request keep-alive transmission module. In case of receiving, the keep-alive period is increased.

In the keep-alive communication system according to an embodiment of the present invention, the keep-alive period adjustment module may receive the reply message from the server despite the transmission of the reply request keep-alive message by the reply request keep-alive transmission module. If not received, characterized in that to reduce the keep-alive period.

In the keep-alive communication system according to an embodiment of the present invention, the reply receiving module does not receive the reply message from the server despite the client transmitting the reply request keep-alive message of the reply request keep-alive transmission module. And reconnect to the communication network, and keep the keepalive period adjustment module at the reduced keepalive period.

In a keep-alive communication system according to an embodiment of the present invention, when the keep-alive period adjustment module is connected to a mobile communication-based data communication network provided by a mobile communication network operator, the communication equipment of the mobile communication-based data communication network may be configured. The keep-alive period may be adjusted to a data communication network allowable time, which is a maximum time for maintaining a network connection of the client not transmitting any message including a keep-alive message.

In the keep-alive communication system according to an embodiment of the present invention, the keep-alive period adjustment module may fix the transmission period of the reply request keepalive message to the server allowable time, and the reply message according to the transmission of the reply request keepalive message. The transmission period of the reply non-request keepalive message is controlled according to the reception status.

The keep-alive communication client according to the present invention is a client that sends a keep-alive message to a messenger via a UDP / IP protocol to a server in order to maintain an online state, and is a keep-alive message requesting a reply message to the server. Reply request keepalive transmission module for transmitting a keepalive message; An unsolicited keep-alive transmission module for transmitting an unsolicited keep-alive message that is a keep-alive message that does not request the reply message to the server; A reply receiving module for receiving the reply message from the server; And when the reply message according to the reply request keep-alive message is received, increases the keep-alive period, which is the transmission period of the keep-alive message, and fails to receive the reply message according to the reply request keep-alive message. And a keep-alive period adjustment module for reducing the keep-alive period.

In the keep-alive communication client according to an embodiment of the present invention, the keep-alive period adjustment module may be configured to have a server allowable time, which is a maximum allowable time for the server to keep the client online without receiving a message including a keep-alive message. Adjusting the keep-alive period in the range.

The keep-alive communication client according to an embodiment of the present invention, if the reply receiving module does not receive the reply message from the server despite the reply request keepalive message transmission of the reply request keepalive transmission module, transmits to the communication network. Reconnect and keep the keepalive period adjustment module at a reduced keepalive period.

In the keep-alive communication client according to an embodiment of the present invention, when the keep-alive period adjustment module is connected to a mobile communication-based data communication network provided by a mobile communication network provider, the keep-alive communication client may keep the communication equipment of the mobile communication-based data communication network. The keep-alive period is adjusted to the data communication network allowable time, which is the maximum time for maintaining the network connection of the client which does not transmit any message including the live message.

In the keep-alive communication client according to an embodiment of the present invention, the keep-alive period adjustment module fixes the transmission period of the reply request keep-alive message to the server allowable time, and sends the reply message according to the send-back request keep-alive message. The transmission period of the reply non-request keepalive message is controlled according to the reception status.

In a keep-alive communication method according to the present invention, a keep-alive communication method in which a client transmits a keep-alive message to a server according to a UDP / IP protocol, and the server keeps the client that has sent the keep-alive message online. ,

A first step of the client accessing the server through a communication network; A second step of the client transmitting the keepalive message to the server according to a keepalive period; The server receives the keepalive message, but if the keepalive message is a reply request request message, the reply message is sent to the client and the keepalive message does not require a reply message. A third step of returning to a second step in the case of a keep-alive message; A fourth step of increasing the keepalive period and returning to the second step when the client sends the reply request keepalive message to the keepalive message and receives the reply message from the server according to the reply request keepalive message; step; And if the client sends the reply request keepalive message to the keepalive message and fails to receive the reply message from the server according to the reply request keepalive message, reducing the keepalive period and returning to the second step. The fifth step; characterized in that comprises a.

In the keep-alive communication method according to an embodiment of the present invention, the fourth step is the keep in the range of server allowance time, the maximum allowable time for the server to keep the client online without receiving a message including a keep-alive message. It is characterized by increasing the alive cycle.

In the keep-alive communication method according to an embodiment of the present invention, the third step may include transmitting at least one reply request keepalive message as the keepalive message within a server allowable time period, and send the reply request keepalive message. In case of not sending, the keep-alive message is a non-reply request keep-alive message which does not request the reply message to the server.

The keep-alive communication method according to an embodiment of the present invention is characterized in that the fifth step returns to the second step after the client reconnects to the communication network.

In the keep-alive communication method according to an embodiment of the present invention, when the client accesses the mobile communication-based data communication network provided by the mobile communication network operator, the keep-alive message is transmitted by the communication equipment of the mobile communication-based data communication network. The keep-alive period is adjusted to the data communication network allowable time, which is the maximum time for maintaining the network connection of the client which does not transmit any message.

Finally, the keep-alive communication method according to an embodiment of the present invention, in the fourth step and the fifth step, the transmission period of the reply request keepalive message is fixed by the server allow time, and the reply request The transmission period of the reply non-request keepalive message is controlled according to whether the reply message is received according to the keepalive message transmission.

The present invention is to solve the above problems, the keep-alive communication system, the client and the communication method according to the present invention, unnecessarily frequent keep-alive by finding and determining the optimal keep-alive period in the communication path currently connected to the client It prevents network overload due to message transmission and reduces the power consumption of the client terminal.

In the keep-alive communication system, the client, and the communication method according to an embodiment of the present invention, in the keep-alive communication using UDP / IP, which is a protocol that cannot confirm whether a message is normally delivered, a request for a keep-alive message is requested. Through the method of determining whether the keepalive message is delivered normally, it provides the effect of determining the optimal keepalive period.

In a keep-alive communication system, a client, and a communication method according to another embodiment of the present invention, when a client accesses a mobile communication-based data communication network provided by a mobile communication network operator, communication devices of the mobile communication-based data communication network may send a keep-alive message. By adjusting the keep-alive period to the data communication equipment allowable time, which is the maximum time to maintain the client's network connection that does not transmit any messages, the time required for searching for the optimal keep-alive period when accessing the mobile communication-based data communication network is reduced. to provide.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram of a keep-alive communication system for transmitting / receiving a non-request keepalive message.
2 is a configuration diagram of a keepalive communication system for transmitting and receiving a reply request keepalive message;
3 is a detailed configuration diagram of a client according to an embodiment of the present invention.
4 is a detailed configuration diagram of a server according to an embodiment of the present invention.
5 is a configuration diagram showing an example of a network configuration of a keepalive communication system according to an embodiment of the present invention;
6 is a timing diagram of transmission of a keepalive message of a keepalive communication system according to an exemplary embodiment of the present invention;
7 is a flowchart of a keepalive communication method according to an embodiment of the present invention;

2 illustrates a keepalive communication system in accordance with the present invention. The keepalive communication system according to the present invention includes a client 100 and a server 200.

The client 100 performs a function of transmitting a keep-alive message (keep-alive_msg) to the server 200 through a UDP / IP protocol, and a user terminal such as a general mobile communication terminal, a smartphone, a notebook PC, and a tablet PC. Can be.

The server 200 maintains an online state of the client 100 continuously transmitting a message including a keep-alive message (keep-alive_msg) and transmits any message including a keep-alive message (keep-alive_msg) for a predetermined time. The client 100 does not perform the function of managing the offline state. The server 200 may be, for example, a messenger server continuously checking the online state of the client 100 through a communication network and providing the online state of the clients 100 to another user client 100.

3 shows a detailed configuration of the client 100 according to the present invention. The client 100 is configured to include a reply request keepalive transmission module 110, a non-reply request keepalive transmission module 120, a keepalive period adjustment module 130, and a reply reception module 150.

The reply request keepalive transmission module 110 transmits a reply request keepalive message (ackable_keep-alive_msg) which is a keepalive message (keep-alive_msg) requesting a reply message (ack_msg) to the server 200.

On the other hand, the non-reply request keep-alive transmission module 120 transmits a non-request keep-alive message (non_ackable_keep-alive_msg) that is a keep-alive message (keep-alive_msg) that does not require a reply message (ack_msg) to the server 200. Do this.

However, keepalive communication is mainly used to quickly check the online status of each client 100. Due to its characteristics, it is inefficient to use the TCP / IP protocol that maintains a communication session and enables stable communication. It is common. The non-request keepalive message (non_ackable_keep-alive_msg) is a keepalive message (keep-alive_msg) in the general UDP / IP protocol as shown in FIG. 1 and performs only a function of notifying the server 200 of its online status. It does not require a separate reply message (ack_msg) to the server 200. The reply request keepalive message (ackable_keep-alive_msg) is a reply message (ack_msg) to the server 200 with a function of notifying the server 200 of its online status as in the case of the TCP / IP protocol as shown in FIG. ) To send.

Next, the reply receiving module 150 performs a function of receiving a reply message (ack_msg) transmitted by the server 200 that receives the reply request keepalive message (ackable_keep-alive_msg), and keeps a keepalive period adjustment module ( 140 performs a function of adjusting the keep-alive period (T _K ) of the keep-alive message (keep-alive_msg) according to whether or not to receive the reply message (ack_msg) according to the transmission of the reply request keepalive (ackable_keep-alive_msg).

When the server 200 receives the keepalive receiving module 210 that receives the keepalive message (keep-alive_msg) and the reply request keepalive message (ackable_keep-alive_msg) from the client 100, the server 200 sends a reply message to the client 100. It comprises a reply transmission module 220 for transmitting (ack_msg).

By such a configuration, the client 100 of the keep-alive communication system according to the present invention provides an effect of searching for and applying an optimal keep-alive period T _K in the net environment of the communication network to which the client belongs.

Hereinafter, a process of searching for the optimal keepalive period T _K of the keepalive communication system according to the present invention in the network environment shown in FIG. 5 will be described. The client 100 may access the server 200 through the communication path 1, the communication path 2, or the communication path 3, and may receive the client 100 without transmitting or receiving any message, including a keep-alive message (keep-alive_msg). It is assumed that the server allowable time T _S , which is the maximum allowable time that the server 200 keeps online, is 300 seconds. If the client 100 and the server 200 that are already recognized as online by the server 200 do not receive any message for 300 seconds, the server 200 converts the state of the client 100 to an offline state. However, if there is a message transmission and reception between the server 200 and the client 100 within 300 seconds, the server 200 maintains the online state of the client 100.

If the client 100 receives the reply message ack_msg according to the reply request keepalive message (ackable_keep-alive_msg), and 50 seconds is set as the initial keepalive period T _K , the keepalive period adjustment module 130 Assume that the keepalive period T _K is increased by 50 seconds.

To confirm whether or not the server 200 receives the keep-alive message (keep-alive_msg), the request to keep a keep alive message transmits at least one keep-alive message (ackable_keep-alive_msg) at least once within 300 seconds, which is the server allowable time (T _S ). It is desirable to transmit. Sending all keepalive messages (keep-alive_msg) as a request keepalive message (ackable_keep-alive_msg) has the advantage of speeding up the search of the optimal keepalive period (T _K ), but frequently returning messages (ack_msg) from the server 200. ) Increases the network load. Therefore, it is desirable to appropriately mix and send a reply request keepalive message (ackable_keep-alive_msg) and a reply non-request keepalive message (non_ackable_keep-alive_msg).

6 shows an optimal keepalive period T _K search procedure. The thick arrows indicate reply request keepalive messages (ackable_keep-alive_msg); otherwise arrows indicate reply non-request keepalive messages (non_ackable_keep-alive_msg). As shown in Figure 6 (a) keep-alive period (T _K) of 50 seconds, if a server time-of-sheet which is 300 seconds, the sixth keep-alive message (keep-alive_msg) is reply requirement keepalive message (ackable_keep-alive_msg ) for transmission, the keep-alive period (T _K) is 100 seconds, if the every third keep alive message (keep-alive_msg that second server timeout of 300 as shown in Figure 6 (c)) is reply requirement keepalive As a message (ackable_keep-alive_msg), and as shown in FIG. 6 (d), when the keepalive period T _K is 200 seconds, only one keepalive message (keep-alive_msg) within 300 seconds, which is a server timeout. As it transmits, it sends a reply request keepalive message (ackable_keep-alive_msg).

First, a case in which the client 100 transmits a keep-alive message (keep-alive_msg) to the server 200 through communication path 1 will be described. The network equipment 311 of the communication path 1 has a device allowable time T _D of 350 seconds. As shown in Fig. 6 (a), the initial keepalive period T _K starts at 50 seconds. Every 50 seconds, the non-request keepalive message (non_ackable_keep-alive_msg) is sent, and the sixth keepalive message (keep-alive_msg) is sent at 300 seconds, the server allow time (T _S ), and the reply request keepalive message (ackable_keep- alive_msg). The server 200 receiving the reply request keepalive message (ackable_keep-alive_msg) transmits a reply message (ack_msg) to the client 100, and the client 100 receiving the reply message (ack_msg) keeps a keepalive period (T). _K ) In 50 seconds, it is confirmed that the keep-alive communication is normally performed, and the keep-alive period T _K is increased by 50 seconds, and is changed to 100 seconds as shown in FIG. 6 (b).

Thereafter, as shown in FIGS. 6 (c) to 6 (f), the keep-alive period T _K is increased by 50 seconds to reach 300 seconds, the server allowable time T _S of the server 200. . At this time, if the keep-alive period T _K becomes larger than the server allowable time T _S , the server 200 recognizes that there is no message within the server allowable time T _S and offline the corresponding client 100 that is online. Problems with misidentification may arise. In order to prevent such a problem, the keep-alive period adjusting module 130 is configured to adjust the keep-alive period T _K in the range of the server allowable time T _S.

Next, the case in which the minimum equipment allowable time T _D of the network equipment 321 and 322 is 100 seconds and shorter than the server allowable time T _S 300 seconds as shown in the communication path 2 will be described. The alive period T _K is increased to 50 seconds, 100 seconds, and 150 seconds as shown in FIGS. 6 (a), 6 (b), and 6 (c). However, when the keep-alive period (T _K ) is 150 seconds, the network time limit exceeds 100 seconds, which is the equipment time limit of the network equipment 322, and the network connection is released by the network equipment 322. Therefore, even when the reply request keepalive message (ackable_keep-alive_msg) is transmitted, the server 200 does not receive the reply request keepalive message (ackable_keep-alive_msg) and the client 100 may not receive the reply message from the server 200. In this case keep-alive interval adjustment module 130 is currently in the keep alive period (T _K) is recognized as 150 seconds more than the equipment allows the time (T _D) of the network devices existing in the network path, keep alive period (T _K ) To 100 seconds again. At this time, the client 100 reconnects to the communication network to recover the released communication, and the keep-alive period adjustment module 130 is reduced keep-alive to prevent the keep-alive period T _K from repeatedly increasing and decreasing. It is desirable to maintain the period T _K.

The communication path 3 determines the optimal keepalive period T _{K in the} same manner as the communication path 2 when the minimum device allowable time T _D of the network device is 200 seconds. The keep-alive period T _K is increased to 250 seconds, and disconnection by the network equipment prevents the client 100 from receiving the reply message ack_msg, thereby reducing the keep-alive period T _K back to 200 seconds.

In the keep-alive communication using the UDP / IP protocol through this method, a keep-alive message (keep-alive_msg) of the server 200 using a reply request keepalive message (ackable_keep-alive_msg) and a reply message (ack_msg) accordingly. The client 100 checks whether the reception is performed and adjusts the keepalive period T _K according to the reception. Thus, the client 100 may search for the optimal keepalive period T _K.

According to another embodiment, the keepalive period adjusting module 130 fixes the transmission period of the reply request keepalive message (ackable_keep-alive_msg) to the server allowable time T _S , and transmits the reply request keepalive message (ackable_keep-alive_msg). According to whether or not to receive a reply message (ack_msg) can be configured to control the transmission period of the non-return request keepalive message (non_ackable_keep-alive_msg). According to this embodiment, the transmission period of the reply request keepalive message (ackable_keep-alive_msg) is fixed to the server allowable time T _{S and} only the transmission period of the non-return request keepalive message (non_ackable_keep-alive_msg) changes.

Meanwhile, the client 100 such as a smartphone may access the server 200 through a general Internet such as a WiFi wireless LAN, or may use a server through a data communication network provided by a mobile communication provider such as WCDMA or Long Term Evolution (LTE). 200 can be connected. Mobile communication based data communication networks provide services to a wide range of regions using the same communication equipment. Therefore, the mobile communication based data communication network has the same equipment allowance time (T _D ) anytime and anywhere. When the equipment allowable time T _D of the mobile communication based data communication network is referred to as the data communication equipment allowable time T _DD , the client 100 accesses the mobile communication based data communication network and transmits a keep-alive message (keep-alive_msg). It is preferable to apply the data communication network equipment allowance time T _DD to the keep-alive period T _K without searching for the optimal keep-alive period T _K described above.

When the data communication network is connected, the client 100 may identify the data communication network to which the client 100 is connected through a mobile country code (MCC) and a mobile network code (MNC) received from the data communication network. Various methods may be implemented by the client 100 to obtain information regarding a data communication network equipment allowable time (T _DD ) of the data communication network. For example, the data communication network or the server 200 directly informs the client 100 of the data communication network equipment allowable time (T _DD ) or the optimal keepalive period (T _K ) searched when the client 100 accesses the data communication network. It can be implemented by saving and saving the new optimal keepalive period (T _K ) again without any additional search.

A data communication network equipment allowable time (T _DD ) of the mobile communication based data communication network provided by the mobile communication provider is 150 seconds and B data communication network equipment allowance time (T _D ) of the mobile communication based data communication network provided by the mobile communication provider is 350 In the case of the second, when the client 100 is connected to the data communication network of the mobile operator A, the keep-alive period adjusting module 130 immediately applies 150 seconds as the keep-alive period (T _K ), and the data communication network of the B mobile communication provider. If the connection to the keep-alive interval adjustment module 130 to the 300 server acceptable time (T _S) seconds because the data communication network equipment allows the time (T _D) is longer than the server allows time (T _S), keep alive period (T _K Can be configured to apply

7 illustrates a keepalive communication method according to an embodiment of the present invention. According to the keep-alive communication method according to the present invention, first, the client 100 performs a first step S10 of accessing the server 200 through a communication network. For example, if the client 100 is a smartphone equipped with a messenger program, the messenger program automatically connects to the messenger server according to whether the smartphone is powered on, or connects to the messenger server according to the user's login through the messenger program. One step (S10) can be implemented.

Next, the client 100 performs a second step S20 of transmitting a keepalive message keep-alive_msg to the server 200 according to the keepalive period T _K. In the case of a smartphone equipped with a messenger program, even if the user enters the idle mode without input, the keep-alive message (keep-alive_msg) is continuously transmitted to the server 200 according to the UDP / IP protocol.

In this case, when the client 100 accesses a mobile communication based data communication network provided by a mobile communication network operator, the client device 100 does not transmit any message including a keep-alive message (keep-alive_msg) by the communication equipment of the mobile communication based data communication network. It is preferable to configure the keep-alive period T _K to be the data communication network equipment allowable time T _DD , which is the maximum time for maintaining the network connection. According to this embodiment, when accessing a mobile communication-based data communication network and sending a keep-alive message (keep-alive_msg), a keep-alive period optimized for the data communication network quickly without a procedure for searching for a separate optimal keep-alive period (T _K ) Provides the effect of quickly applying (T _K ).

Next, when the server 200 receives the keepalive message (keep-alive_msg) but the keepalive message (keep-alive_msg) is a reply request keepalive message (ackable_keep-alive_msg) requesting a reply message (ack_msg), the client ( Send a reply message (ack_msg) in step 100) and return to the second step (S20) if the keepalive message (keep-alive_msg) is a non-requested keepalive message (non_ackable_keep-alive_msg) that does not require a reply message (ack_msg). The third step S30 is performed. The reply request keepalive message (ackable_keep-alive_msg) is for checking the communication connection status of the current client 100, and the non-request request keepalive message (non_ackable_keep-alive_msg) is composed of a general UDP / IP message.

In this case, the more frequently the reply request keepalive message (ackable_keep-alive_msg) is, the faster the search for the optimal keepalive period (T _K ) is effected, but the burden of the communication network increases due to the increase in the reply message (ack_msg). To solve this problem, as shown in FIG. 6, at least one reply request keepalive message (ackable_keep-alive_msg) is transmitted as a keepalive message (keep-alive_msg) within a server allowable time T _S , and a reply is made. If the request keepalive message (ackable_keep-alive_msg) is not sent, the server 200 transmits the non-requested keepalive message (non_ackable_keep-alive_msg) that does not require a reply message (ack_msg) as a keepalive message (keep-alive_msg). It is preferable to configure so that.

Next, the client 100 transmits a reply request keepalive message (ackable_keep-alive_msg) as a keepalive message (keep-alive_msg) and returns a reply message from the server 200 according to the reply request keepalive message (ackable_keep-alive_msg). When ack_msg) is received, a fourth step S40 of increasing the keep-alive period T _K and returning to the second step S20 is performed.

In this case, in order to prevent the keepalive period T _K from being set beyond the server time limit in the fourth step S40, the server 200 does not receive a message including a keep-alive message (keep-alive_msg). It is configured to increase the keep-alive period T _K in the range of the server allowable time T _S , which is the maximum allowable time for keeping 100 online.

Finally, the client 100 transmits a reply request keepalive message (ackable_keep-alive_msg) as a keepalive message (keep-alive_msg) and returns a reply message (from the server 200 according to the reply request keepalive message (ackable_keep-alive_msg). If ack_msg) is not received, a fifth step S50 of reducing the keep-alive period T _K and returning to the second step S20 is performed. The reply message was not received despite the transmission of the request-back keepalive message (ackable_keep-alive_msg) because the current keepalive period (T _K ) is set to be greater than the equipment allowable time (T _D ) of the network device on the communication path. It may be determined that the communication network connection is released. Therefore, the keepalive period (T _K ) should be readjusted within the allowable time. At this time, it is preferable that the client 100 reconnect to the communication network before returning to the second step.

100: client
110: keep-alive transmission module requesting a reply
120: no-request keepalive transfer module
130: keepalive period adjustment module
150: reply receiving module 200: server

Claims (18)

A client sending a keepalive message via a UDP / IP protocol; And
A keep-alive communication system, comprising: a server that keeps the client online according to receipt of the keep-alive message from the client.
The client may include a reply request keepalive transmission module for transmitting a reply request keepalive message, which is a keepalive message requesting a reply message to the server; An unsolicited keep-alive transmission module for transmitting an unsolicited keep-alive message that is a keep-alive message that does not request the reply message to the server; A reply receiving module for receiving the reply message from the server; And a keep-alive period adjustment module for adjusting a keep-alive period, which is a transmission period of the keep-alive message, according to whether or not the reply message is received according to the transmission of the reply request keep-alive message.
The server may include a keepalive receiving module for receiving the keepalive message from the client and a reply transmitting module for transmitting the reply message to the client when receiving the reply request keepalive message. Alive communication system.
According to claim 1, wherein the keep-alive period adjustment module,
The keep-alive communication system, wherein the server adjusts the keep-alive period within a range of a server allowable time, which is a maximum allowable time for keeping the client online without receiving a message including a keep-alive message.
The method of claim 2, wherein the keepalive period adjustment module,
And a keep-alive period of time when the reply receiving module receives the reply message from the server in response to transmission of the reply request keep-alive message by the reply request keep-alive transmission module.
According to claim 3, wherein the keep-alive period adjustment module,
And if the reply receiving module does not receive the reply message from the server despite the reply request keep-alive message being sent by the reply request keep-alive transmission module, reducing the keep-alive period.
The method of claim 4, wherein
The client reconnects to the communication network when the reply receiving module does not receive the reply message from the server despite transmission of the reply request keepalive message by the reply request keepalive transmission module.
And the keep-alive period adjusting module maintains the reduced keep-alive period.
According to claim 1, wherein the keep-alive period adjustment module,
When the client accesses a mobile communication based data communication network provided by a mobile communication network operator, the maximum time for which the communication equipment of the mobile communication based data communication network maintains the connection of the client which does not transmit any message including the keepalive message. A keep-alive communication system, characterized in that for adjusting the keep-alive period in the data communication network equipment allowable time.
The method of claim 2, wherein the keepalive period adjustment module,
The transmission period of the reply request keep-alive message is fixed to the server allowable time, and the transmission period of the unsolicited keep-alive message is controlled according to whether or not the reply message is received according to the transmission of the reply request keep-alive message. Keepalive Communication System.
In a client sending a keepalive message to a messenger via a UDP / IP protocol to a server to stay online,
A reply request keepalive transmission module for transmitting a reply request keepalive message, which is a keepalive message requesting a reply message to the server;
An unsolicited keep-alive transmission module for transmitting an unsolicited keep-alive message that is a keep-alive message that does not request the reply message to the server;
A reply receiving module for receiving the reply message from the server; And
When the reply message according to the reply request keep-alive message is received, the keep-alive period, which is a transmission period of the keep-alive message, is increased, and when the reply message according to the reply request keep-alive message is not received, the reply message is received. A keep-alive communication client comprising a; keep-alive period adjustment module, characterized in that for reducing the keep-alive period.
The method of claim 8, wherein the keep-alive period adjustment module,
The keep-alive communication client, characterized in that the server adjusts the keep-alive period in the range of the server allowable time which is the maximum allowable time for keeping the client online without receiving a message including a keep-alive message.
The method of claim 9,
The client reconnects to the communication network when the reply receiving module does not receive the reply message from the server despite transmission of the reply request keepalive message by the reply request keepalive transmission module.
And the keep-alive period adjusting module maintains the reduced keep-alive period.
The method of claim 8, wherein the keep-alive period adjustment module,
When the client accesses a mobile communication based data communication network provided by a mobile communication network operator, the maximum time for which the communication equipment of the mobile communication based data communication network maintains the connection of the client which does not transmit any message including the keepalive message. The keep-alive communication client, characterized in that for adjusting the keep-alive period to the data communication network allow time.
10. The method of claim 9, wherein the keep-alive period adjustment module,
The transmission period of the reply request keep-alive message is fixed to the server allowable time, and the transmission period of the unsolicited keep-alive message is controlled according to whether or not the reply message is received according to the transmission of the reply request keep-alive message. Keepalive communication client.
A keep-alive communication method in which a client transmits a keep-alive message to a server according to a UDP / IP protocol, and the server keeps the client that has sent the keep-alive message online.
A first step of the client accessing the server through a communication network;
A second step of the client transmitting the keepalive message to the server according to a keepalive period;
The server receives the keepalive message, but if the keepalive message is a reply request request message, the reply message is sent to the client and the keepalive message does not require a reply message. A third step of returning to a second step in the case of a keep-alive message;
A fourth step of increasing the keepalive period and returning to the second step when the client sends the reply request keepalive message to the keepalive message and receives the reply message from the server according to the reply request keepalive message; step; And
Reducing the keepalive period and returning to the second step if the client sends the reply request keepalive message to the keepalive message and fails to receive the reply message from the server according to the reply request keepalive message. Keep alive communication method comprising a; 5 step.
The method of claim 13, wherein the fourth step,
And the keep-alive period is increased within a range of a server allowable time which is a maximum allowable time for the server to keep the client online without receiving a message including a keep-alive message.
The method of claim 13, wherein the third step,
At least one reply request keep-alive message is transmitted as the keep-alive message within the server allowable time range, and if the reply request keep-alive message is not sent, a reply non-request request that does not request the reply message to the server A keep-alive communication method, characterized in that for transmitting an alive message to the keep-alive message.
The method of claim 13, wherein the fifth step,
And the client returns to the second step after reconnecting to the communication network.
The method of claim 13, wherein the second step,
When the client accesses a mobile communication based data communication network provided by a mobile communication network operator, the maximum time for which the communication equipment of the mobile communication based data communication network maintains the connection of the client which does not transmit any message including the keepalive message. The keep-alive communication method, characterized in that for adjusting the keep-alive period by the data communication network allow time.
The method of claim 14, wherein the fourth step and the fifth step,
The client fixes the transmission period of the reply request keep-alive message to the server allowable time, and controls the transmission period of the reply-unsolicited keep-alive message according to whether the reply message is received according to the reply request keepalive message transmission. Keepalive communication method characterized in that.

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