KR20150118334A - Radio communication system and method for prevent communication cutoff - Google Patents

Radio communication system and method for prevent communication cutoff Download PDF

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Publication number
KR20150118334A
KR20150118334A KR1020140044058A KR20140044058A KR20150118334A KR 20150118334 A KR20150118334 A KR 20150118334A KR 1020140044058 A KR1020140044058 A KR 1020140044058A KR 20140044058 A KR20140044058 A KR 20140044058A KR 20150118334 A KR20150118334 A KR 20150118334A
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South Korea
Prior art keywords
slave node
node
rcf
master
racf
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KR1020140044058A
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Korean (ko)
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KR101574172B1 (en
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차봉상
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주식회사 우리별
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Priority to KR1020140044058A priority Critical patent/KR101574172B1/en
Priority to PCT/KR2014/003485 priority patent/WO2015160013A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H04W84/20—Master-slave selection or change arrangements

Abstract

The present invention relates to a wireless communication system and method for preventing communication disruption, and in which a first RCF (Request Control Frame) is transmitted to perform communication with at least one slave node existing in a network, A first slave node which waits for a RACF (Reauthentication Acknowledge Control Frame) in response to the RACF response, and transmits a second RCF to a master node existing in the network if the RACF can not be returned; 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 is to communicate. Accordingly, it is possible to solve communication disruption inevitably due to the movement of the node, thereby preventing communication disruption.

Description

TECHNICAL FIELD [0001] The present invention relates to a radio communication system and a method for preventing communication disruption,

The disclosed technique is directed to a wireless communication system and method that prevents communication disruption that occurs as the signal travels beyond the communication range.

The ISO / IEC 29157 international standard is used to establish a wireless communication network capable of transmitting and receiving various types of media data in a variety of applications from near-field, low-speed and low-power in the industrial, scientific and medical (ISM, Industry, Science, Medicine) It is a universal wireless communication technology standard that can be widely applied.

The ISO / IEC 29157 international standard is a synchronous network having a master-slave relationship in which a plurality of slave nodes synchronize with a synchronous signal periodically generated by one master node in the network. Therefore, the quality of service (QoS) is excellent, and commercialization in the field of voice and audio is proceeding successfully.

On the other hand, these ISO / IEC 29157 international standards can be used for digital radio systems that professionally support team-level activities. For example, it can be used for security activities, leisure activities or rescue activities. However, there is a problem in that communication becomes impossible when the node to which data is to be transmitted goes out of the range of the signal.

In order to prevent the above-described problem, a system has been developed in which a warning is issued to the user by alerting the user when the node leaves the communicable distance.

However, when an activity is performed in units of a team, each member continuously moves while holding his / her terminal, so that a certain distance may inevitably deviate from the communicable distance. However, if you get into the distance that the signal reaches again, you will have difficulties because there are restrictions on the activity.

Prior art relating to a radio system using the ISO / IEC 29157 international standard is disclosed in Korean Patent Publication No. 10-2013-0083946 entitled " Personal Space Service Convergence and Container-based Wireless Network " Protocol) and Korean Patent Laid-Open No. 10-2011-0059652 (entitled " Method and System for Supporting Interference-free Relaying between Near-Field Pico Cells).

The disclosed technique is to provide a wireless system and method for preventing communication disruption due to signal distraction distance deviation.

According to a first aspect of the present invention, there is provided a method for transmitting a first RCF (Request Control Frame) to perform communication with at least one slave node in a network, (RACF) to the first slave node when the first slave node waits for a Reach Acknowledge Control Frame (RACH) and if the RACF can not be returned, transmits a second RCF to the master node existing in the network, and transmits 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 to which the first slave node is to communicate.

According to a second aspect of the present invention, a first slave node transmits a first request control frame (RCF) to a second slave node and a request acknowledge control frame (RACF) for the first slave node Transmitting a second RCF to the master node as the first slave node generates a timeout for the RACF, transmitting the RACF for the second RCF to the first slave node at the master node Transmitting a Master Control Frame (MCF) to the second slave node, and transmitting a Master Acknowledge Control Frame (MACF) for the MCF at the second slave node; Method.

Embodiments of the disclosed technique may have effects that include the following advantages. It should be understood, however, that the scope of the disclosed technology is not to be construed as limited thereby, since the embodiments of the disclosed technology are not meant to include all such embodiments.

According to an embodiment of the disclosed technology, a radiocommunication system and method for preventing communication disruption fundamentally solves a communication disruption inevitably caused by movement of a node, thereby preventing communication disruption.

In addition, it has an advantage that it can be universally applied in establishing a wireless communication network.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 illustrates a wireless communication system that prevents communication disruption in accordance with one embodiment of the disclosed technology.
2 is a flow diagram of a wireless communication method for preventing communication disruption in accordance with one embodiment of the disclosed technique.
Figure 3 is a diagram of a network between a master node and a slave node.
Fig. 4 is a diagram showing communication disruption caused by movement of a node. Fig.
5 is a flow diagram illustrating two-hop based information transmission in accordance with one embodiment of the disclosed technique.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the 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 may be used to distinguish one component from another . For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that the singular < RTI ID = 0.0 > terms < / RTI > used herein should be interpreted to include a plurality of representations unless the context clearly dictates otherwise. And "comprises ", when used in this specification, specify the presence of stated features, numbers, steps, operations, elements, parts, or combinations thereof, Or combinations thereof, as a matter of course.

Before describing the drawings in detail, it is to be clarified that the division of constituent parts in this specification is merely a division by main functions of each constituent part. That is, two or more constituent parts to be described below may be combined into one constituent part, or one constituent part may be divided into two or more functions according to functions that are more subdivided.

In addition, each of the constituent units described below may additionally perform some or all of the functions of other constituent units in addition to the main functions of the constituent units themselves, and that some of the main functions, And may be carried out in a dedicated manner. Accordingly, the presence or absence of each component described in this specification should be interpreted as a function.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 illustrates a wireless communication system that prevents communication disruption in accordance with one embodiment of the disclosed technology. Referring to FIG. 1, a wireless communication system for preventing communication disruption transmits a first request control frame (RCF) to perform communication with at least one slave node existing in a network, (RACF) to the master node existing in the network if the RACF can not be returned to the first slave node (110) waiting for the first slave node (Request Acknowledge Control Frame) 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 is to communicate.

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 referred to as a first slave node.

Prior to the description of the disclosed technology, it is noted that the manner of transmitting data at the first slave node 110 and the master node 120 is in conformity with the standard of the International Standard ISO / IEC 29157. 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 include wireless 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 carried by personnel of a rescue team or security company. The disclosed technique describes a technique for preventing communication disconnection between these wireless terminals.

The first slave node 110 transmits a first RCF to any one of S1, S2, S4 and M existing in the network. Here, S1, S2 and S4 are other slave nodes acting as the first slave node, and M is a master node 120 for transmitting a synchronization signal to surrounding slave nodes for forming the network. The first RCF is a control frame for confirming whether the other party can receive data before transmitting the data.

Meanwhile, for a more detailed description of how the first slave node 110 transmits the RCF in the disclosed technique, the configuration of the conventional radio communication network and the transmission of the RCF in the network will be described with reference to FIGS. 3 and 4 Explain.

Figure 3 is a diagram of a network between a master node and a slave node. And FIG. 4 is a diagram illustrating communication disruption caused by movement of a node. 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 part of the figure indicates a synchronous signal transmitted from the master node M. The slave nodes S1 to S5 receive the synchronization signal to form one network.

On the other hand, after the network is formed, the plurality of slave nodes and the master node can exchange data with each other. Referring to the lower part of FIG. 3, it is confirmed that data communication is performed in both directions between each other.

However, this is simply the number of cases in which data communication is possible. In practice, it uses RCF (Request Control Frame) to determine whether the other party can receive data to transmit data communication. In this process, the RACF (Request Acknowledge Control Frame) is received in response to the RCF to determine whether the other party can receive the data.

On the other hand, if the RACF is received according to the RCF transmission as described above, the data can be transmitted, but the RACF may not be received according to the RCF transmission. For example, as shown in FIG. 4, the situation may be such that the opposite node leaves the distance that the RCF can reach.

Referring again to FIG. 4, S3 transmits the RCF first to transmit data to S4. However, S4 is a situation where the RCF can not be transmitted and the RACF for the RCF can not be transmitted. Therefore, S3 and S4 can not transfer data to each other. The disclosed technique attempts to prevent communication disruption caused by the movement of the node to such a distance that the signal can not reach.

Referring back to FIG. 1, the first slave node 110 (S3) wants to communicate with the fourth node (S4). However, as shown in FIG. 4, S4 moves to a position where the RCF can not be received, and the RACF for the RCF is not received.

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

If the RACF is not received, the first slave node 110 transmits the 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 that has been transmitted.

The master node (120) receives the second RCF from the first slave node (110). And transmits the RACF for the second RCF to the first slave node 110. That is, the first slave node 110 can prepare for data transmission.

Also, the master node 120 transmits the MCF to at least one slave node to which the first slave node 110 transmits data. Here, MCF (Master Control Frame) means a control frame transmitted from the master node. Since the first slave node 110 is far from the node to which data is to be transmitted and can not transmit the RCF, the master node 120 is located closer to the first slave node 110 than the first slave node 110, It is possible.

Meanwhile, the master node 120 receives a MACF (Master Acknowledge Control Frame) for the MCF. Then, it confirms that the node is ready to receive data. Since the first master node has received the RACF for the RCF, it transmits data to the master node 120. The master node receives the data and transmits the data to the node to which the first slave node 110 transmits data.

That is, in the conventional ISO / IEC 29157 standard protocol, the transfer of one hop is performed by two nodes using the master node. In the case of a protocol for transmitting data in one hop, there is a situation in which communication disconnection occurs due to deviation of the signal communication distance as described above.

In one embodiment, in the case of a rescue team or a security company operating on a team basis, the position is continuously moved in order to perform the mission. In such a case, the distance may be exceeded at which the data can be transmitted in one hop at any moment. In this case, it is impossible to transmit data.

On the other hand, when the two-hop communication is performed using the master node 120 according to the disclosed technique, there is an advantage that the constraint condition for the signal communication distance does not occur. In addition, it offers the advantage of being able to move more freely and perform missions.

2 is a flow diagram of a wireless communication method for preventing communication disruption in accordance with one embodiment of the disclosed technique. And Figure 5 is a flow diagram illustrating two-hop based information transmission according to one embodiment of the disclosed technique. 2 and 5, a radio communication method for preventing communication disruption includes transmitting a first RCF (Request Control Frame) to a second slave node in a first slave node, and transmitting a Request Acknowledge Control (RACF) (220) for a second RCF to the master node as the first slave node generates a timeout for the RACF, the method comprising the steps of: (220) RACF to the first slave node and transmitting a master control frame (MCF) to the second slave node; and transmitting, at the second slave node, a master acknowledge control frame (MACF) for the MCF (Step 240).

In step 210, the first slave node transmits a first RCF (Request Control Frame) to the second slave node and waits for a RACF (Request Acknowledge Control Frame) for the first RCF.

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

Meanwhile, the first slave node, the second slave node and the master node follow the communication protocol of the ISO / IEC 29157 international standard. And each node includes a wireless 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 carried by personnel of a rescue team or security company. The disclosed technique describes a technique for preventing communication disconnection between these wireless terminals.

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

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

On the other hand, the RACF may not be returned. For example, the situation may be such that the second slave node moves out of the reach of the RCF of the first slave node.

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

When the timeout for the RCF occurs, the first slave node determines that the second slave node has moved out of the signal coverage distance. And transmits the second RCF to the master node existing in the network. That is, since the second slave node can not receive the RCF, the next slave node transmits the next RCF to the master node.

In step 230, the master node transmits an RACF for the second RCF to the first slave node and transmits a master control frame (MCF) to the second slave node. And 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 of the first slave node transmits the MCF to the second slave node to receive the data of the first slave node. The MCF is a control frame transmitted from the master node. Here, it can perform the same function as the RCF.

In step 240, the second slave node transmits a MACA (Master Acknowledge Control Frame) for the MCF. The second slave node receives the MCF from the master node and transmits the MACF in response to the MCF. In contrast to the first slave node, the second slave node informs 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, the transfer of one hop is performed by two nodes using the master node. In the case of a protocol for transmitting data in one hop, there is a situation in which communication disconnection occurs due to deviation of the signal communication distance as described above.

In one embodiment, in the case of a rescue team or a security company operating on a team basis, the position is continuously moved in order to perform the mission. In such a case, the distance may be exceeded at which the data can be transmitted in one hop at any moment. In this case, it is impossible to transmit data.

On the other hand, when the two-hop communication is performed 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, it offers the advantage of being able to move more freely and perform missions.

Although a wireless 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 the sake of understanding, it is merely an example, and those skilled in the art It will be understood that various modifications and equivalent embodiments may be possible. Accordingly, the true scope of protection of the disclosed technology should be determined by the appended claims.

110: first slave node 120: master node
210: First RCF transmission and RACF standby 220: Second RCF transmission to the master node
230: RACF transmission and MCF standby 240: MACF transmission to MCF

Claims (8)

And transmits a first RCF (Request Control Frame) to perform communication with at least one slave node existing in the network, waits for a RACF (Reauthentication Acknowledge Control Frame) in response to the first RCF, A first slave node for transmitting a second RCF to a master node existing in the network; And
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 is to communicate The wireless communication system comprising: 2. The method of claim 1, wherein the first slave node comprises:
Wherein when the RACF for the first RCF is not returned within a predetermined waiting time and a timeout occurs, it is determined that the at least one slave node is out of signal communication distance. 2. The method of claim 1,
And transmitting a master acknowledge control frame (MACF) in response to the MCF from the at least one slave node to the at least one slave node, system. The method according to claim 1,
Wherein the master node, the first slave node, and the at least one node prevent communication discontinuities including wireless terminals of the same model from each other. Transmitting a first Request Control Frame (RCF) to the second slave node at the first slave node and waiting for a Request Acknowledge Control Frame (RACF) for the first RCF;
Sending a second RCF to the master node as the first slave node generates a timeout for the RACF;
Transmitting a RACF for the second RCF from the master node to the first slave node and transmitting an MCF (Master Control Frame) to the second slave node; And
And transmitting a MACA (Master Acknowledge Control Frame) to the MCF at the second slave node. 6. The method of claim 5, wherein the first slave node comprises:
And when the timeout occurs, it is determined that the at least one slave node is out of the signal communication distance. 6. The method of claim 5,
And returning the MACF from the second slave node, wherein the data transmitted from the first slave node is transmitted to the second slave node. 6. The method of claim 5,
Wherein the master node, the first slave node, and the second slave node prevent communication discontinuities including wireless terminals of the same model from each other.
KR1020140044058A 2014-04-14 2014-04-14 Radio communication system and method for prevent communication cutoff KR101574172B1 (en)

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PCT/KR2014/003485 WO2015160013A1 (en) 2014-04-14 2014-04-22 Radio communication system and method for preventing communication interruption

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