KR20110050314A - Emergency message transmission method and apparatus - Google Patents

Abstract

PURPOSE: An urgency message transferring method is provided to not to allocate a resource for urgent message in advance, thereby improving efficiency of the system. CONSTITUTION: A first device(200) receives a polling message of a third device. A coordinator(100) broadcasts a second polling message. The first device broadcasts the adverse signaling. The first device thereafter transmits an urgent message to the coordinator after a random delay offset time. A second device(300) obtains a transmission chance in some point of the future by a predetermined process. The second device transmits UL(UpLink) data.

Description

Emergency message transmission method and device {EMERGENCY MESSAGE TRANSMISSION METHOD AND APPARATUS}

The present invention relates to short-range wireless communication, and more particularly, to a method and apparatus for transmitting an urgent coordinator terminal emergency message when a device terminal needs to transmit data urgently in a wireless body area network.

Personal Area Network (PAN), which is called personal area network, is a concept in contrast to the well-known local area network (LAN) or long-distance network (WAN), which means that each individual has a unique network. In other words, each terminal owned by one person makes a network for the convenience of that person. The concept of constructing such a PAN wirelessly is a wireless personal area network (WPAN).

In an effort to implement PAN wirelessly, the Institute of Electrical and Electronics Engineers (IEEE) 802.15 Working Group has set WPAN as the standard for short-range wireless networks. In the IEEE 802.15 Working Group, the IEEE 802.15.1 standard known as Bluetooth, the IEEE 802.15.3 and IEEE 802.15.3a standards related to high rate WPAN, and the IEEE 802.15.4 standard known as ZigBee. I'm working on it. In particular, recently, a wireless human body area for providing medical services, such as telemedicine, and wearable equipment for wearable computing or entertainment services using motion sensors, through a communication network around a human body of about 3 meters. Standardization work on a Wireless Body Area Network (WBAN) is underway by 802.15.6 TG6.

1 is a diagram illustrating a configuration of a general WBAN. Referring to FIG. 1, in the WBAN, an individual configures one network, that is, the piconet 10. The piconet 10 includes a coordinator terminal 11 such as a mobile communication terminal, a notebook computer, a PDA, an implant device or a sensor that can be implanted in various peripheral devices or the body that can be mounted outside the body. Same number of participating device terminals 12, 13, 14. The device terminals 12, 13, and 14 may include a wireless headset, a wireless headset, a wireless mouse, a wireless keyboard, and the like. Hereinafter, the coordinator terminal is briefly referred to as the coordinator, and the device terminal is simply referred to as a device. The WBAN is mainly aimed at a small sized device having a mobile power source such as a sensor having poor power conditions, so low power becomes the most important system requirement.

In general, when a piconet consisting of participating devices such as peripherals or sensors that can be mounted outside the body is formed, the coordinator and the device connect channels and transmit data according to a polling method to satisfy low power requirements. Receive. The polling method is advantageous for low power compared to the conventional beacon-based resource access method.

According to the existing beacon-based resource access method, a participating device to access a resource or channel receives a beacon broadcasted by a coordinator and checks a resource allocation section assigned to itself, and relates to data transmission and reception in the resource allocation section. Perform the action. That is, the device transmits and receives data according to the resource allocation interval, and maintains a sleep state for the remaining intervals other than the resource allocation interval for low power operation. Accordingly, when the device does not perform data communication or does not receive a beacon, the device operates in a sleep state, switches to a wakeup state according to the transmission time of the beacon, receives the beacon, and receives resource allocation interval information included in the beacon. Check and go back to sleep. The device switches to the wake-up state at the start time of the resource allocation section according to the resource allocation section information and performs a predetermined transmission / reception operation.

However, since the power consumed during the transition between the sleep state and the wake-up state, this frequent state transition causes a lot of power consumption. In addition, since the resource allocation information included in the beacon informs all participating devices that are scheduled to access resources in this superframe at once, one participating device requires unnecessary decoding process and thus consumes power. Affects.

In order to reduce the power consumption, the polling method determines a polling interval for each device in advance when the coordinator and the device are initially connected, and configures a polling message for each device and transmits the polling period to the corresponding polling interval. As a result, the device wakes up to the polling interval assigned to the device and handles synchronization adjustment by the polling message, confirmation of resource access command, and data transmission / reception and transitions to a sleep state, thereby satisfying a low power requirement.

On the other hand, WBAN has a requirement to send an emergency message immediately before the superframe ends. This is because, when an emergency situation occurs in a participating device and a message related to the same needs to be transmitted, the coordinator needs to allocate resources immediately for the participating device. However, in the beacon-based resource access method, after the resource allocation information is already informed through the beacon, additional resources for emergency message transmission cannot be allocated. In the polling method, since polling intervals are specified for each device, it is difficult to immediately allocate resources for emergency message transmission.

In order to solve this problem, there is a method in which a predetermined amount of resources of the superframe are emptied for emergency messages. However, there is a problem in that resources are not utilized efficiently because emergency situations do not always occur. In addition, since an emergency message can be sent only in a specific section of the superframe, there is a disadvantage in that an emergency situation cannot be immediately dealt with.

In order to solve these problems, the present invention provides a method and apparatus capable of transmitting an emergency message using a resource quickly and efficiently when a participating device wants to send an emergency message to a coordinator.

In another aspect, the present invention provides a method for a device included in a piconet to transmit an emergency message according to an emergency in a wireless communication system around a human body, the process of configuring an emergency message for an emergency, and the other devices included in the piconet. Predicting a transmission time of a resource access information message, generating and broadcasting a disturbance signal that prevents normal reception of the other device with respect to the resource access information message at the predicted transmission time; And transmitting the emergency message to the coordinator of the piconet using the allocated radio resource interval.

The present invention provides a device for transmitting an emergency message according to an emergency by a device included in a piconet in a wireless communication system around a human body, comprising an interference signal generation unit for generating an interference signal, an emergency message for an emergency, Predicting a transmission time of a resource access information message of another device included in the piconet and controlling the interference signal generator to prevent normal reception of the other device with respect to the resource access information message at the estimated transmission time; And a processor configured to broadcast a disturbance signal to be generated and to transmit the emergency message to the coordinator of the piconet using a radio resource interval allocated to the other device.

The present invention can increase system efficiency because it does not allocate resources for emergency messages in advance, and enables the device to promptly send an emergency message when needed, thereby enabling rapid processing of the emergency message.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the same components in the drawings are represented by the same reference numerals and symbols as much as possible even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In the Wireless Body Area Network (WBAN) to provide medical services such as telemedicine and wearable equipment for wearable computing or entertainment services using motion sensors, through a communication network around the human body The piconet to which the present invention is applied consists of a coordinator such as a mobile communication terminal and a plurality of participating devices such as various types of peripherals or sensors attached to the body.

In the piconet, the device may need to deliver an emergency message to the coordinator in a sudden situation without a radio resource allocated to the device. In this case, when the device according to the present invention generates a disturbance signal at the transmission time for the resource access information message of the other device, and thus the other device is not able to receive the resource access information message normally, and thus cannot use the radio resource, The emergency message is transmitted by utilizing the radio resource of another device.

2 and 3 show the configuration of the coordinator and the device to which the present invention is applied. 2 is a view showing the configuration of the coordinator 100 according to an embodiment of the present invention, Figure 3 is a view showing the configuration of a first device 200 according to an embodiment of the present invention. Hereinafter, it is assumed that the coordinator 100, the first device 200, and the second device 300 constitute one piconet in the WBAN.

Referring to FIG. 2, in accordance with an embodiment of the present invention, the coordinator 100 includes a first processor 110, a first transmitter / receiver 120, and a first memory unit 130.

The first transmitter / receiver 120 transmits or receives data through a communication link formed with the device under the control of the first processor 110, and processes the data accordingly.

The first memory unit 130 may operate as a working memory of the first processor 110 and store various information necessary for performing wireless communication in the WBAN.

The first processor 110 controls the first transmitter / receiver 120 and the first memory unit 130 according to a data communication operation with each device of the WBAN piconet. The first processor 110 determines a polling period corresponding to each device included in the piconet in the superframe in order to allocate radio resources to the devices configuring the piconet. The polling interval is a radio resource interval allocated to the device. When the device is first connected to the coordinator 100, the length of the polling interval to be used by the device and the position in the superframe are determined. The length of the polling interval corresponding to each device may be the same or different depending on the type or characteristic of the device. The length and position of the polling interval determined for each device are kept the same for each superframe except in a special case. The information on the polling interval thus determined is transferred to the corresponding device when the device first connects to the coordinator 100.

In addition, the first processor 110 configures a resource access information message, for example, a polling message, including information on transmission / reception data related to the corresponding device, a resource access command, and a polling interval length information for each polling period. Send and receive data.

When data is transmitted from the coordinator 100 to a specific device, that is, when downlink data is transmitted, the first processor 110 constructs a polling message related to this and transmits the polling message to the specific device in the corresponding polling period. When the Ack message is received from the specific device, the downlink data is transmitted. When the coordinator 100 does not have data to transmit to a specific device or needs to receive data from a specific device, that is, when uplink data should be received, a polling message including information on the uplink data may be configured to specify a specific polling period. Pass to the device. And it receives uplink data from a specific device.

After the first processor 110 transmits a polling message in a polling interval for a specific device according to an embodiment of the present invention, the first processor 110 maintains a reception wait state even if an acknowledgment or upstream data is not received from the specific device within a predicted time. do. When an emergency message is received from a device other than a specific device, the first processor 110 transmits an Ack message for the emergency message to another device and processes the emergency message. As such, the first processor 110 preferentially processes the emergency message, and thus, the first processor 110 may not process the data related to the specific device in the current polling interval. Data for a specific device that has not been processed may be processed in a polling section corresponding to a specific device in the next superframe, or may be processed in a remaining section after the entire polling section is completed in the current superframe.

Meanwhile, referring to FIG. 3, the first device 200 includes a second processor 210, a second transmitter / receiver 220, a second memory unit 230, and an interference signal generator 240. Although FIG. 3 illustrates the configuration of the first device 200 as an example, other devices may be similarly configured.

The second transmitter / receiver 220 transmits or receives data through a communication link formed with the device under the control of the second processor 210 and processes the data accordingly.

The second memory unit 230 may operate as a working memory of the first processor 110 and store various information necessary for performing wireless communication in the WBAN. That is, the second memory unit 230 stores polling interval information that is received by the first device 200 when the first device 200 is connected to the coordinator 100.

The second processor 210 controls the second transmitter / receiver 220 and the second memory unit 230 according to a data communication operation with the coordinator of the WBAN piconet. The second processor 210 controls an operation for first access to the coordinator 100 in the contention access section of the WBAN superframe, and stores the polling section information received from the coordinator 100 after the connection is successful. Store in The controller determines the polling interval and polling message transmission time allocated to itself by referring to the polling interval information, and when the corresponding time is reached, the polling state is received and the polling message is received. The second processor 210 refers to the information included in the polling message, transmits an Ack message and receives downlink data or transmits uplink data in the corresponding polling interval. When the transmission and reception of data is completed or the polling period designated to the user is completed, the second processor 210 may switch to a sleep state.

In addition, the second processor 210 may urgently transmit information to the coordinator 100 due to an emergency situation such as a change in an internal state of the first device 200 or a failure, battery discharge, or sudden generation of important data. When it is detected, it will switch to weather conditions and construct an emergency message related to the emergency. The second processor 210 predicts a time for transmitting a polling message of another device. To this end, the next polling message transmission time can be predicted by referring to the polling message received in the polling period for the self or another device. The device may be assigned a polling interval in the current superframe, but may not exist depending on the period of traffic, so it is necessary to read the first polling message received while waiting in a reception state and to know the length of the polling interval. However, when all polling sections have the same length, the polling message transmission time of another device may be predicted by referring to the polling message received in the own polling section.

In other words, when the length of the polling interval is the same for each device, the coordinator 100 broadcasts a separate message informing of this to each device included in the piconet by broadcasting a message or using polling interval information when the device is initially connected. It can tell you that the assigned polling intervals are all the same length. In this case, after the second processor 210 enters the wake-up state due to an emergency, the second processor 210 refers to the polling message received at the polling interval of the first device 200 or provides the earliest polling message transmission time. It can be predicted by referring to the received polling interval information.

As another example, when the polling intervals are different for each device, the second processor 210 maintains a reception standby state by designating a different device after receiving a state of emergency and transitioning to a wake-up state. Then predict the time of transmission of the polling message.

The poll message is broadcast, and the designation of the relevant device is made by including the identifier of the device in the poll message. Accordingly, even if the device receives a polling message that does not include its identifier, the device discards it without analyzing if it is in a normal state. However, in an emergency, it is necessary to know when to send a polling message in the next polling interval, so even if another device is a designated polling message, the included information is identified.

Accordingly, the second processor 210 maintains a reception waiting state, analyzes the polling message first received unconditionally, and finds the length of the polling interval, thereby predicting a polling message transmission time of the next polling interval.

In addition, even if the polling intervals are different for each device, the second processor 210 does not receive and analyze a polling message of another device immediately after the polling interval is ended. It is possible to predict when to send a polling message.

In order to transmit the emergency message to the coordinator 100, the second processor 210 controls the interruption signal generator 240 to generate a disturbance signal at the time of transmitting the polling message closest to the current time.

The interference signal generator 240 generates an interference signal under the control of the second processor 210, outputs the interference signal to the second transmitter / receiver 220, and the second transmitter / receiver 220 transmits the interference signal.

The disturbing signal is a signal for preventing another device from receiving a polling message. According to an embodiment of the present invention, the disturbing signal may be a noise random signal that causes interference to the polling message, and has the same structure as the polling message, but is meaningless. It may also consist of a message that contains data. As such, when a disturbance signal is generated at the time of transmitting a polling message for another device, the other device cannot receive the polling message normally.

After transmitting the disturbance signal, the second processor 210 transmits the emergency message to the coordinator 100 through the second transmitter / receiver 220 after a random offset of a predetermined period elapses. That is, the first device 200 interrupts the polling period of another device and transmits its own emergency message.

An example of an emergency message transmission process of the present invention between the coordinator 100 and the devices 200 and 300 configured as described above will be described below with reference to FIGS. 4 and 5. 4 illustrates a data communication process in a normal state in which an emergency message is not generated, and FIG. 5 illustrates a data communication process in case an emergency message is generated.

As shown in FIG. 4, in a normal situation, resource access for each device 200 and 300 is made by a polling message P transmitted by the coordinator 100 according to an embodiment of the present invention. When the polling for all devices is completed in the superframe, a broadcast message called End of Polling (EOP) is finally sent to inform the contention access period of the participating terminal attempting to enter the system for the first time. Indicates the start of the retransmission process.

4 illustrates a process in which two devices access resources by obtaining a polling opportunity once. In the first superframe 21, both the first device 200 and the second device 300 transmit uplink data U1 and U2, and in the second superframe 22, the first device 200 is upward. The data U1 is transmitted, and the second device 300 represents a process of receiving downlink data D2.

When this normal operation is being performed, an emergency event may occur in a device that has already passed a polling opportunity or has not been given a polling opportunity in this superframe, and an emergency message should be sent to the coordinator.

Accordingly, in FIG. 5, there is a situation in which an emergency message needs to be sent immediately after the first device 200 has already transmitted the uplink data. Thus, the first superframe 21 and the second superframe 22 as shown in FIG. ) Shows an example of interrupting the uplink data U2 transmission and the downlink data D2 transmission process of the second device 300.

The first device 200 transitions to a wake-up state immediately before a polling interval assigned to the first device 200 in the first superframe 21. The coordinator 100 constructs a first polling message P1, which is a polling message for the first device 200, and transmits the first polling message P1 to the first device 200 in the polling period of the first device 200. The first device 200 receives the first polling message P1 and transmits uplink data U1 according to the resource access information included in the first polling message P1. The coordinator 100 transmits an acknowledgment message (ACK) to the first device 200 when reception of the upstream data U1 is completed.

Meanwhile, the first device 200 may anticipate a next polling message transmission time, that is, a second polling message P2 corresponding to the second device 300, with reference to the first polling message P1. Can be. Accordingly, the first device 200 generates a disturbance signal at the time of transmitting the second polling message P2 for the second device 300 to transmit the emergency message.

Under normal circumstances, if the channel environment is good, the second device 300 may receive the second polling message P2. However, in FIG. 5, the first device 200 broadcasts a disturbance signal at the same time, and thus the second polling message ( Interferes with normal reception of P2). If the second device 300 wakes up just before the second polling message P2 is transmitted and waits for the reception state, but does not receive the expected second polling message P2 within a predetermined time, an opportunity for resource access in this superframe is received. Abandonment or traffic with demanding delays can be sent when the polling opportunity comes back after EOP.

As the second device 300 does not receive the second polling message P2, a free resource corresponding to the resource connection section, that is, the polling section, is generated for the second device 300. Accordingly, the first device 200 transmits the emergency message E1 to the coordinator 100 by using the free resource after the random delay time 43 after broadcasting the interference signal. When the coordinator 100 normally receives the emergency message E1, the coordinator 100 transmits the Ack message ACK to the first device 200 and processes the emergency message.

Next, an operation process of the first device 200, the second device 300, and the coordinator 100 in the second super frame 22 section may include the first device 200 in the first super frame 21 section, Similar to the operation of the second device 300, the coordinator 100.

6 to 7 are views illustrating an operation process of the first device 200, the second device 300, and the coordinator 100 according to the embodiments of FIGS. 4 and 5.

FIG. 6 includes the uplink data transmission process of the normal second device 300 and FIG. 8 includes the downlink data transmission process of the normal second device 300. FIG. 7 illustrates that the first device 200 sends an emergency message when the second device 300 wants to send uplink data, and FIG. 9 illustrates that when the second device 300 wants to send downlink data. The first device 200 shows a process of sending an emergency message.

The difference between uplink and downlink is that when the downlink data is sent, the device sends an acknowledgment message to the polling message of the coordinator 100, and the coordinator 100 which confirms whether the device is ready for the downlink data is then transmitted.

Referring to FIG. 6, the coordinator 100 transmits a first polling message in step 401. In this case, the first polling message may include information indicating that the first device 200 can transmit uplink data or information for requesting uplink data transmission, and may include information about the size of uplink data that can be transmitted. The first device 200 wakes up before the time of transmitting the first polling message, receives the first polling message in step 403, and transmits uplink data according to the information included in the first polling message. When the transmission is completed, the Ack message is received from the coordinator 100 in step 405.

Then, the coordinator 100 transmits a second polling message to the second device 300 in step 407. In this case, the second polling message includes information similar to the first polling message. The second device 300 wakes up before the time of transmitting the second polling message, receives the second polling message in step 409, and transmits uplink data according to the information included in the second polling message. When the transmission is completed, the Ack message is received from the coordinator 100 in step 411.

FIG. 7 illustrates that when the second device 300 wants to send uplink data, the first device 200 continuously sends an emergency message after its polling interval is completed, and steps 501 to 505 of FIG. 7 are performed. Is similar to steps 401 to 405 of FIG.

After step 505, the coordinator 100 transmits a second polling message in step 507. Accordingly, the second device 300 wakes up before the time of transmitting the second polling message, and tries to receive the second polling message. However, the first device 200 broadcasts a disturbance signal at step 509 at a time similar to step 507 to transmit the emergency message, thereby preventing the second device 300 from receiving the second polling message. Accordingly, the second device 300 does not receive the second polling message, waits for a predetermined time, and then switches back to the sleep state.

After the random offset, the first device 200 transmits an urgent message to the coordinator 100 in step 511, and the coordinator 100 transmits the acknowledgment message accordingly to the first device 200 in step 513. To send.

The second device 300 acquires a transmission opportunity according to steps 515 to 519 at some point in the future by a predetermined process, and sends uplink data. Any point in the future may be set in various ways, such as an interval after the EPO message transmission, or a polling interval of the next superframe.

FIG. 8 includes a downlink data transmission process of the normal second device 300. Steps 601 to 605 are similar to steps 401 to 405 of FIG.

Thereafter, the coordinator 100 transmits a second polling message to the second device 300 in step 607. In this case, the second polling message may include information indicating that downlink data is to be transmitted, and may include size information of the downlink data. When the second device 300 wakes up before the second polling message transmission time and receives the second polling message in step 609, the second device 300 transmits an Ack message to the coordinator 100 in step 611.

When the coordinator 100 receives the Ack message, the coordinator 100 transmits the downlink data to the second device 300 according to the information included in the second polling message in step 611. When the transmission is completed, the coordinator 100 receives the Ack message from the second device 300 in step 613.

9 illustrates a process in which the first device 200 sends an emergency message when the second device 300 wants to send downlink data. The emergency message transmission process for the downlink data of FIG. 9 is also similar to FIG. 7.

Steps 701 to 705 of FIG. 9 are similar to steps 401 to 405 of FIG.

After step 705, the coordinator 100 transmits a second polling message in step 707. Accordingly, the second device 300 wakes up before the time of transmitting the second polling message, and tries to receive the second polling message. However, in order to transmit the emergency message, the first device 200 broadcasts a disturbance signal in step 709 at a time similar to step 707, thereby preventing the second device 300 from receiving the second polling message. Accordingly, the second device 300 does not receive the second polling message, waits for a predetermined time, and then switches back to the sleep state.

In operation 711, the first device 200 transmits an emergency message to the coordinator 100 after a random offset. The coordinator 100 maintains the reception state during the polling period of the second device 300 even if the expected Ack message is not transmitted from the second device 300. At this time, if the emergency message is received from the first device 200, the coordinator 100 transmits the acknowledgment message to the first device 200 in step 713. The coordinator 100 performs appropriate processing in the upper layer according to the type of alarm or emergency signal included in the emergency message.

The second device 300 receives a downlink data by acquiring a transmission opportunity in steps 715 through 721 at some point in the future by a predetermined process. Any point in the future may be set in various ways, such as an interval after the EPO message transmission, or a polling interval of the next superframe.

FIG. 10 is a polling period different for each device according to another embodiment of the present invention, and after the polling period assigned to the first device 200 is completed and a predetermined time has elapsed, that is, successive polling intervals are determined. This is a diagram illustrating a process of transmitting an emergency message after an emergency situation occurs.

Referring to FIG. 10, the first device 200 maintains a sleep state by ending its polling period and enters a wake-up state due to an emergency situation. In order to predict when to send a polling message of another device, it waits until a polling message broadcasted is received while maintaining a reception waiting state. Accordingly, in operation 801, the first device 200 receives a third polling message, which is a polling message of the third device. This indicates that the current superframe interval is a polling interval allocated to the third device. Although the third polling message has an identifier of the third device, the first device 200 may analyze the third polling message to determine when the polling interval of the third device ends, and thus, the next polling interval of the third device. It is possible to predict when to send a polling message. After the prediction, the first device 100 transitions to the sleep state.

In the example of FIG. 10, the next polling interval is a polling interval of the second device 300. Accordingly, after step 801, the coordinator 100 broadcasts the second polling message in step 803. Accordingly, the second device 300 wakes up before the time of transmitting the second polling message, and tries to receive the second polling message. However, in order for the first device 200 to transmit an emergency message, the first device 100 switches to a wake-up state before the expected polling message transmission time, and broadcasts the disturbance signal in step 805 at a time similar to step 803. The second device 300 does not receive the second polling message. Accordingly, the second device 300 does not receive the second polling message, waits for a predetermined time, and then switches back to the sleep state.

After the random offset, the first device 200 transmits an emergency message to the coordinator 100 in step 807, and the coordinator 100 transmits the Ack message according to the first device 200 in step 809. To send.

The second device 300 acquires a transmission opportunity in step 811 to step 815 at some point in the future by a predetermined process, and sends uplink data. Any point in the future may be set in various ways, such as an interval after the EPO message transmission, or a polling interval of the next superframe. In the above example, although only uplink data or downlink data exist in one polling period, uplink data and downlink data in a slot unit may exist together in one polling period. Information about this transmission data is included in the polling message and delivered to the related device.

According to the emergency message operating method and apparatus therefor according to the present invention as described above, like the existing emergency message processing method, the resource for emergency message is not emptied in advance so that the system efficiency is not reduced, and resource allocation is not received when necessary. A participant terminal to send an emergency message stops the resource access process that is already allocated to another participant terminal, and instead, sends an emergency message through the corresponding resource, thereby enabling rapid processing.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

1 is a view showing a piconet of a typical WBAN;

2 is a view showing the configuration of a coordinator according to an embodiment of the present invention;

3 is a view showing the configuration of a device according to an embodiment of the present invention;

4 is a diagram illustrating a data communication process in a normal state in which an emergency message is not generated according to one embodiment of the present invention;

5 is a diagram illustrating a data communication process when an emergency message is generated according to one embodiment of the present invention;

6 to 9 are views illustrating an operation process of the devices and the coordinator according to the embodiments of FIGS. 4 and 5;

10 is a diagram illustrating an emergency message transmission process according to another embodiment of the present invention.

Claims (16)

In a method for transmitting an emergency message according to an emergency by a device included in a piconet for transmitting and receiving data by allocating a radio resource interval for each device in a wireless communication system around the human body, Constructing emergency messages for emergencies, Estimating a transmission time of a resource access information message of another device included in the piconet; Generating and broadcasting a jamming signal that prevents normal reception of the other device with respect to the resource access information message at the estimated transmission time; And transmitting the emergency message to the coordinator of the piconet using a radio resource interval allocated to the other device. The method of claim 1, wherein the emergency message is transmitted after an arbitrary delay time elapses after broadcasting the disturbance signal. The method of claim 2, wherein the predicting of the transmission time point comprises: Waiting for reception of a resource access information message after the occurrence of the emergency; Receiving a random resource access information message, analyzing the random resource access message to determine an end point of a current radio resource interval, and predicting a transmission time of a next resource access message; Transmission method. The method of claim 3, wherein the coordinator normally processes the emergency message received from the device in a radio resource interval allocated to the other device. The method of claim 2, wherein the length of the radio resource interval for each device is the same, and the transmission time point is predicted by referring to a previously received resource access message. The emergency message according to claim 2, wherein when an emergency message needs to be transmitted in a continuous radio resource section in the radio resource section allocated to the self, the transmission time is predicted with reference to a previously received resource access message. Transmission method. The method of claim 4, wherein the interference signal is a random noise signal. 5. The method of claim 4, wherein the disturbance signal is a resource access message including nonsense data. An apparatus for transmitting an emergency message according to an emergency by a device included in a piconet in a wireless communication system around a human body, An interference signal generator for generating an interference signal; Configure an emergency message for an emergency situation, predict the transmission time of the resource connection information message of the other device included in the piconet, and control the disturbance signal generator to control the resource access information message at the estimated transmission time. And a processor for generating and broadcasting the interference signal that prevents normal reception of the other device, and transmitting the emergency message to the coordinator of the piconet using a radio resource interval allocated to the other device. Emergency message transmission device. The apparatus of claim 9, wherein the emergency message is transmitted after an arbitrary delay time elapses after broadcasting the disturbance signal. The method of claim 10, wherein the processor waits to receive a resource access information message after the occurrence of the emergency situation, and when an arbitrary resource access information message is received, analyzes the random resource access message and ends the current radio resource interval. The emergency message transmission apparatus, characterized in that for estimating the transmission time of the next resource access message. The apparatus of claim 11, wherein the coordinator normally processes the emergency message received from the device in a radio resource interval allocated to the other device. 10. The apparatus of claim 9, wherein the length of the radio resource interval for each device is the same, and the transmission time point is predicted by referring to a previously received resource access message. The emergency message as claimed in claim 9, wherein when an emergency message needs to be transmitted in a continuous radio resource interval in the radio resource interval allocated to the self, the transmission time is predicted by referring to a previously received resource access message. Transmission device. The apparatus of claim 11, wherein the interference signal is a random noise signal. The apparatus of claim 11, wherein the interference signal is a resource access message including meaningless data.

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