WO2015160013A1

WO2015160013A1 - Radio communication system and method for preventing communication interruption

Info

Publication number: WO2015160013A1
Application number: PCT/KR2014/003485
Authority: WO
Inventors: 차봉상
Original assignee: 주식회사 우리별
Priority date: 2014-04-14
Filing date: 2014-04-22
Publication date: 2015-10-22
Also published as: KR20150118334A; KR101574172B1

Abstract

A radio communication system for preventing communication interruption, according to the present invention, comprises: a first slave node (110) for transmitting a first request control frame (RCF) so as to communicate with at least one slave node present in a network and waiting for a request acknowledge control frame (RACF) as a response to the first RCF, wherein if the RACF cannot be received, the first slave node transmits a second RCF to a master node present in the network; and the master node (120) for transmitting an RACF in response to the second RCF to the first slave node and transmitting a master control frame (MCF) to the at least one slave node with which the first slave node is to communicate. In addition, a radio communication method for preventing communication interruption comprises: a step (210) of transmitting, by a first slave node, a first RCF to a second slave node and waiting for an RACF in response to the first RCF; a step (220) of transmitting, by the first slave node, a second RCF to a master node according to the occurrence of a timeout for the RACF; a step (230) of transmitting, by the master node, an RACF in response to the second RCF to the first slave node and transmitting an MCF to the second slave node; and a step (240) of transmitting, by the second slave node, a master acknowledge control frame (MACF) in response to the MCF.

Description

Radio communication system and method to prevent communication loss

The technology described below relates to a radio communication system and method that prevents communication disruptions that occur as a result of signal out of range.

ISO / IEC 29157 is an international standard for establishing a wireless communication network that can transmit and receive media data of various formats in a single platform at short, low speed, and low power in the ISM, Industry, Science, and Medicine bands. It is a universal wireless communication technology standard that can be widely applied.

The ISO / IEC 29157 international standard is a synchronous network in which a plurality of slave nodes perform communication by synchronizing synchronization signals generated periodically by one master node in a network. Therefore, the quality of service (Qos, Quality of Service) guarantees excellent commercialization in the field of voice and audio has been successful.

Meanwhile, these ISO / IEC 29157 international standards can be used for digital radio systems that specialize in supporting team activities. For example, it can be used for security activities, leisure activities or rescue activities. However, there is a problem that communication is impossible when the node to transmit data goes out of the reach of the signal.

In order to prevent the above problem, a system has been developed to warn the user of a distance deviation by sounding an alarm when a node leaves a communication distance.

However, in the case of performing any activity on a team basis, each member keeps moving with his own terminal, so it may inevitably deviate from the communication distance at any moment. However, entering the distance within which the signal comes back will limit the activity, causing difficulties.

Conventional techniques for radio systems using ISO / IEC 29157 international standards include Korean Patent Application Laid-Open No. 10-2013-0083946 (name of the invention: a wireless network with a container structure made to allow convergence of personal space services and interference avoidance between all users). Protocol) and Korean Patent Application Laid-Open No. 10-2011-0059652 (name of the invention: a method and system for supporting relay without interference between short-range picocells).

The disclosed technology provides a radio system and method for preventing communication loss due to deviation of signal communication distance.

The radio communication system for preventing communication loss described below transmits a first request control frame (RCF) to perform communication with at least one slave node existing in a network, and in response to the first RCF, RACF (Reauest). Wait for an Acknowledge Control Frame, but if it fails to return the RACF, transmit a first slave node for transmitting a second RCF to a master node existing in the network and a RACF for the second RCF to the first slave node, And a master node for transmitting a master control frame (MCF) to the at least one slave node with which the first slave node wants to communicate.

The radio communication method for preventing communication loss described below transmits a first request control frame (RCF) from a first slave node to a second slave node and waits for a request acknowledgment control frame (RACF) for the first RCF. The first slave node sending a second RCF to a master node as a timeout for the RACF occurs, the master node sending a RACF for the second RCF to the first slave node, Transmitting a master control frame (MCF) to the second slave node; and transmitting a master acknowledgment control frame (MAFC) for the MCF from the second slave node.

The technology described below provides an effect of preventing communication loss by fundamentally solving the communication loss that occurs inevitably with the movement of the node.

In addition, there is an advantage that can be applied universally in building a wireless communication network.

1 is a diagram illustrating a wireless communication system for preventing communication disruption according to an embodiment of the disclosed technology.

2 is a flow chart of a radio communication method for preventing communication disruption according to an embodiment of the disclosed technology.

3 is a diagram for forming a network between a master node and a slave node.

4 is a diagram illustrating communication interruption that occurs as a node moves.

5 is a flowchart illustrating 2-hop based information transmission according to an embodiment of the disclosed technology.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms first, second, A, B, etc. may be used to describe various components, but the components are not limited by the terms, but merely for distinguishing one component from other components. Only used as For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

As used herein, the singular forms "a", "an" and "the" are to be understood as including plural forms unless the context clearly dictates otherwise. And the term " comprises, " and the like, means that there is a feature, number, step, action, component, part, or combination thereof described, and one or more other features or numbers, step action component, part, etc. Or it does not exclude the presence or the possibility of adding them.

Prior to the detailed description of the drawings, it is to be clear that the division of the components in the present specification is only divided by the main function of each component. That is, two or more components to be described below may be combined into one component, or one component may be provided divided into two or more for each function.

Each of the components to be described below may additionally perform some or all of the functions of other components in addition to the main functions of the components, and some of the main functions of each of the components are different. Of course, it may be carried out exclusively by. Therefore, the presence or absence of each component described through this specification should be functionally interpreted.

1 is a diagram illustrating a wireless communication system for preventing communication disruption according to an embodiment of the disclosed technology. Referring to FIG. 1, a radio communication system for preventing communication loss transmits a first request control frame (RCF) to communicate with at least one slave node existing in a network, and responds to the RACF in response to the first RCF. Wait for (Request Acknowledge Control Frame), but if the RACF is not returned, the first slave node 110 for transmitting a second RCF to the master node existing in the network and the RACF for the second RCF are assigned to the first slave. And a master node 120 for transmitting a master control frame (MCF) to the at least one slave node to which the first slave node communicates.

The first slave node 110 refers to any one of a plurality of slave nodes existing in the network. For a more detailed description of the disclosed technique, S3 shown in FIG. 1 will be the first slave node.

Prior to the description of the disclosed technology, the method of transmitting data from the first slave node 110 and the master node 120 reveals that the form conforms to the standard of the ISO / IEC 29157 international standard. That is, each node follows the communication protocol of the ISO / IEC 29157 international standard.

In addition, the first slave node 110 and the master node 120 includes radio terminals of the same model. That is, each node is a radio terminal having a role of a master node or a slave node. For example, it may be a radio possessed by personnel of a rescue team or bodyguard. The disclosed technology describes a technique for preventing communication loss between such radio terminals.

The first slave node 110 transmits a first RCF to any one of them in order to communicate with S1, S2, S4 and M existing in the network. Here, S1, S2, and S4 are other slave nodes serving as the first slave node, and M is a master node 120 which transmits a synchronization signal to neighboring slave nodes to form the network. The first RCF refers to a control frame that checks whether the other party can receive data before transmitting data.

Meanwhile, for a more detailed description of transmitting the RCF by the first slave node 110 in the disclosed technology, referring to FIGS. 3 and 4, a conventional radio communication network and transmitting the RCF within the network are described. Explain.

3 is a diagram for forming a network between a master node and a slave node. 4 is a diagram illustrating communication interruption that occurs as a node moves. Referring to FIG. 3, it can be seen that the master node and the plurality of slave nodes form one radio communication network. The dotted line shown in the upper figure of the figure means a synchronization signal transmitted from the master node M. The slave nodes S1 to S5 receive the synchronization signal to form a network.

Meanwhile, after the network is formed, the plurality of slave nodes and the master node may exchange data with each other. Referring to the lower figure of FIG. 3, it can be seen that data communication is performed in both directions.

However, this simply represents the number of cases where data communication is possible. In fact, the Request Control Frame (RCF) is used to transmit data communication to determine whether the other party can receive data. In this process, by receiving a Request Acknowledge Control Frame (RACF) in response to the RCF, it is determined whether the other party can receive data.

Meanwhile, as described above, data may be transmitted when RACF is received according to RCF transmission, but may also occur when RACF is not received according to RCF transmission. For example, as shown in FIG. 4, it may be a situation where the other node leaves the distance within which the RCF can reach.

Referring back to FIG. 4, S3 first transmits an RCF to transmit data to S4. However, S4 is a situation in which the RACF cannot be transmitted by moving to a distance where the RCF cannot be transmitted. Thus, S3 and S4 cannot transmit data between each other. The disclosed technique attempts to prevent communication disruption that occurs as the node moves to such a distance that the signal cannot reach.

Referring back to FIG. 1, S3, the first slave node 110, intends to communicate with S4. However, as shown in FIG. 4, S4 moves to a distance at which the RCF cannot receive the RCF and thus cannot receive the RACF for the RCF.

Here, the first slave node determines that the at least one slave node is out of signal communication distance when a timeout occurs because the RACF for the first RCF is not returned for a predetermined waiting time.

If the RACF is not received, the first slave node 110 transmits a second RCF to the master node existing in the network. Here, the second RCF is a control frame to be transmitted after the first RCF previously transmitted.

The master node 120 receives the second RCF from the first slave node 110. The RACF for the second RCF is transmitted to the first slave node 110. That is, the first slave node 110 may prepare for data transmission.

In addition, the master node 120 transmits an MCF to at least one slave node to which the first slave node 110 wants to send data. Here, MCF (Master Control Frame) means a control frame transmitted from the master node.

The first slave node 110 cannot transmit an RCF because the distance to the node to transmit data is far from the node, but the master node 120 is located at a relatively closer distance than the first slave node 110 to transmit MCF. It is possible.

Meanwhile, the master node 120 receives a master acknowledgment control frame (MACF) for the MCF. Then, check whether the node can receive data. Since the first master node has previously received the RACF for the RCF, the first master node transmits data to the master node 120. The master node receives the data and transfers the data to the node to be transmitted from the first slave node 110.

That is, in the conventional ISO / IEC 29157 standard protocol, one hop is transmitted to two hops using a master node. As described above, in the case of a protocol for transmitting data in one hop, a situation in which communication disruption occurs due to signal deviation is out of range.

In one embodiment, rescue teams or bodyguards working in teams continue to move positions to perform their missions, which may cause them to move beyond the distance at which they can transmit data in one hop. In this case it is not possible to transmit the data.

On the other hand, if the two-hop communication using the master node 120 according to the disclosed technology there is an advantage that the constraint on the signal communication distance does not occur. In addition, the benefits of being able to move more broadly and freely and perform missions are also provided.

2 is a flow chart of a radio communication method for preventing communication disruption according to an embodiment of the disclosed technology. And FIG. 5 is a flowchart illustrating two-hop based information transmission according to an embodiment of the disclosed technology. Referring to FIGS. 2 and 5, a radio communication method for preventing communication loss may include transmitting a first request control frame (RCF) from a first slave node to a second slave node, and request acknowledgment control for the first RCF. Frame 210), in which the first slave node transmits a second RCF to the master node 220 as a timeout for the RACF occurs, 220 in the master node for the second RCF. Transmitting RACF to the first slave node, transmitting a master control frame (MCF) to the second slave node (230) and transmitting a master acknowledgment control frame (MACF) for the MCF from the second slave node; And step 240.

In step 210, the first slave node transmits a first request control frame (RCF) to the second slave node, and waits for a request acknowledgment control frame (RACF) for the first RCF.

Here, the first slave node 110 refers to any one of the plurality of slave nodes existing in the network as described above with reference to FIG. 1. For a more detailed description of the disclosed technique, S3 shown in FIG. 5 will be the first slave node.

Meanwhile, in this case, the first slave node, the second slave node, and the master node comply with the communication protocol of the ISO / IEC 29157 international standard. Each node includes a radio terminal of the same model.

That is, each node is a radio terminal having a role of a master node or a slave node. For example, it may be a radio possessed by personnel of a rescue team or bodyguard. The disclosed technology describes a technique for preventing communication loss between such radio terminals.

Meanwhile, the first slave node S3 intends to communicate with the second slave node S4. Therefore, the RCF is transmitted to the second slave node. RCF means a control frame according to the communication protocol of ISO / IEC 29157 international standard. That is, the RCF is a control frame that checks whether the other party can receive data before transmitting data.

Meanwhile, the first slave node waits for a RACF for the RCF to be returned. The RACF considers that the other party is ready to receive data if the RACF is returned in response to the RCF.

On the other hand, the RACF may not be returned. For example, it may be a situation in which the second slave node moves out of a distance that the RCF of the first slave node can reach.

In step 220, the first slave node transmits a second RCF to the master node as a timeout for the RACF occurs. As described above, as the second slave node moves out of the signal communication distance, a timeout for the previously transmitted RCF occurs in the first slave node.

When the timeout for the RCF occurs as described above, the first slave node determines that the second slave node has moved out of the signal communication distance. The second RCF is transmitted to a master node existing in the network. That is, since the next second slave node cannot receive the RCF, the next RCF is transmitted to the master node.

In step 230, the master node transmits a RACF for the second RCF to the first slave node and transmits a master control frame (MCF) to the second slave node. The master node transmits the RACF for the second RCF to the first slave node so that the first slave node can transmit data.

The control frame transmits its MCF to the second slave node that will receive data of the first slave node. The MCF is a control frame transmitted from the master node and may play a role as an RCF here.

In step 240, the second slave node transmits a MAC Acknowledgment Control Frame (MACF) for the MCF. The second slave node receives the MCF from the master node and transmits a MACF in response to the MCF. In contrast to the first slave node, the second slave node notifies that it is ready to receive data by transmitting the MACF.

Meanwhile, the master node receives data transmitted from the first slave node and transmits the data to the second slave node. That is, two-hop data communication is performed. That is, in the conventional ISO / IEC 29157 standard protocol, one hop is transmitted to two hops using a master node. As described above, in the case of a protocol for transmitting data in one hop, a situation in which communication disruption occurs due to signal deviation is out of range.

On the other hand, if the two-hop communication using the master node according to the disclosed technology there is an advantage that the constraint on the signal communication distance does not occur. In addition, the benefits of being able to move more broadly and freely and perform missions are also provided.

Radio communication system and method for preventing communication disruption according to an embodiment of the disclosed technology has been described with reference to the embodiments shown in the drawings for ease of understanding, but this is merely illustrative, those of ordinary skill in the art It will be appreciated that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the disclosed technology should be defined by the appended claims.

Claims

In order to communicate with at least one slave node existing in the network, a first request control frame (RCF) is transmitted, and a response to the first RCF waits for a response acknowledgment control frame (RACF), and the RACF is returned. If not, a first slave node transmitting a second RCF to a master node existing in the network; And

A master node transmitting a RACF for the second RCF to the first slave node and transmitting a master control frame (MCF) to the at least one slave node to which the first slave node wants to communicate. Radio communication system to prevent.
The method of claim 1, wherein the first slave node,

12. The radio communication system of claim 1, wherein the at least one slave node is determined to be out of signal communication range when a timeout occurs because the RACF for the first RCF is not returned for a predetermined waiting time.
The method of claim 1, wherein the master node,

When the MACF is returned from the at least one slave node in response to the MCF, the radio communication prevents a communication failure of transmitting data transmitted from the first slave node to the at least one slave node. system.
The method of claim 1,

And wherein said master node, said first slave node and said at least one node comprise wireless terminals of the same model.
Transmitting a first request control frame (RCF) from the first slave node to the second slave node and waiting for a request acknowledgment control frame (RACF) for the first RCF;

Sending, by the first slave node, a second RCF to a master node as a timeout for the RACF occurs;

Transmitting, at the master node, a RACF for the second RCF to the first slave node, and transmitting a master control frame (MCF) to the second slave node; And

And transmitting, by the second slave node, a master acknowledgment control frame (MACF) for the MCF.
The method of claim 5, wherein the first slave node,

The wireless communication method for preventing a communication failure to determine that the at least one slave node is out of signal communication distance when the time out occurs.
The method of claim 5, wherein the master node,

And if the MACF is returned from the second slave node, prevents communication loss of transmitting data transmitted from the first slave node to the second slave node.
The method of claim 5,

The master node, the first slave node and the second slave node is a radio communication method for preventing communication disruption including a wireless terminal of the same model.