KR102249407B1 - Device and Method to Communication Packet Processing in Multi-hop based Low Power Wide Area Communication Network - Google Patents

Abstract

The present invention relates to a communication terminal for processing a communication packet in a multi-hop-based low power wide area communication network and a method thereof and, more specifically, to a communication terminal for processing a communication packet in a multi-hop-based low power wide area communication network and a method thereof, which receive a first communication packet from another communication terminal to wake up the first communication packet based on a wakeup preamble included in the first communication packet and decode a data part further included in the first communication packet and process the data part based on the decoded data part and a routing table to minimize an operating time of the communication terminal, thereby efficiently using limited power.

Description

{Device and Method to Communication Packet Processing in Multi-hop based Low Power Wide Area Communication Network}

The present invention relates to a communication terminal and a method for processing a communication packet in a multi-hop-based low-power wide area communication network, and more specifically, a wake-up included in the first communication packet by receiving a first communication packet from another communication terminal. It wakes up based on the preamble, decodes the data part further included in the first communication packet, and processes the data part based on the decoded data part and the routing table, thereby minimizing the operation time of the communication terminal and efficiently reducing the limited power. The present invention relates to a communication terminal and method for processing communication packets in a multi-hop based low-power wide area communication network that can be used.

The Internet of Things (IoT) is that all things (devices) are connected to the Internet and communicate directly with each other.Through the communication between things, the data collected or derived by things are transmitted to other things. IoT is attracting attention as a next-generation technology and infrastructure in that it can create various added values by allowing specific services and other services or specific industries and other industries to be fused.

In order to implement the IoT, a communication network having a wide communication range and low power consumption is required, and for this purpose, a low power wide area network communication technology is being actively developed. Currently, representative communication methods for implementing a low-power wide area communication network include LTE-M (Machine Type Communication) using the existing LTE frequency band and LoRaWAN (Long Range Wide Area Network) using frequencies in the unlicensed band.

On the other hand, devices connected through the Internet of Things are located in various places or environments. Therefore, in the case of devices that are connected to a regular power source and are not continuously supplied with power and are powered by a battery, power consumption is reduced to perform long-term communication. Methods are needed to minimize it.

In addition, since a large number of devices need to be connected on the network to create various added values through the Internet of Things, devices have the characteristics of being produced at low cost, and therefore, smooth communication in consideration of the limited memory size and computing power constituting the device. Methods are required to do this.

In addition, in addition to using the above-described low-power wide area communication technology, various approaches have been developed to extend the life cycle of the device by minimizing power consumption of the device. As one of these methods, in the communication method of the device, the data with the minimum transmission power that can be communicated normally is transmitted, and only a part of the data is first determined and the data to be processed is processed only when the data to be processed is received. It is a situation in which the development of technology to minimize power consumption is required.

The present invention relates to a communication terminal and a method for processing a communication packet in a multi-hop-based low-power wide area communication network, and more specifically, a wake-up included in the first communication packet by receiving a first communication packet from another communication terminal. It wakes up based on the preamble, decodes the data part further included in the first communication packet, and processes the data part based on the decoded data part and the routing table, thereby minimizing the operation time of the communication terminal and efficiently reducing the limited power. An object of the present invention is to provide a communication terminal and method for processing communication packets in a multi-hop based low-power wide area communication network that can be used.

In order to solve the above problems, in an embodiment of the present invention, as a communication packet processing method in a communication terminal of a multi-hop-based low-power wide area communication network, a first including a wake-up preamble and a data unit from another communication terminal. A wakeup preamble receiving step of receiving the wakeup preamble of a communication packet; A wakeup detection step of deriving a wakeup preamble detection value based on the wakeup preamble and preamble pattern data stored in the communication terminal, and generating a wakeup signal according to the wakeup preamble detection value; A data unit receiving step of waking up from a sleep state according to the wakeup signal and receiving a data unit of the first communication packet; And a data unit for decoding the MAC header included in the data unit received in the data unit receiving step, and processing the data unit based on reception address information included in the decoded MAC header and a routing table stored in the communication terminal. It provides a communication packet processing method including; processing step.

In an embodiment of the present invention, in the data unit processing step, when the reception address information of the decoded MAC header corresponds to a communication terminal that has received the data unit, the entire data unit is decoded and the decoded data unit is A data copy decoding step provided to an upper layer; When the reception address information of the decoded MAC header does not correspond to the communication terminal receiving the data unit and the reception address information is included in the routing table, a second data unit including the data unit received in the data unit receiving step A second communication packet transmission step of transmitting the communication packet to another communication terminal corresponding to the reception address information and the routing table; And when the reception address information of the decoded MAC header is not included in the routing table, a sleep state conversion step of stopping reception of the data unit and switching from a wake-up state to a sleep state.

In one embodiment of the present invention, the wakeup detection step includes XNOR for each of the one or more detailed data included in the preamble pattern data and the corresponding detailed data included in the wakeup preamble of the first communication packet. The sum of the calculated values derived by calculation may be derived as the wakeup preamble detection value.

In an embodiment of the present invention, in the data unit processing step, when Time to Live information further included in the decoded MAC header is less than or equal to a preset value, reception of the data unit is stopped and a wake-up state is performed. It may include; a sleep state conversion step of converting to a sleep state.

In an embodiment of the present invention, the configuration for performing the wakeup detection step may be configured as hardware so that only the wakeup detection step is performed, and the configuration for performing the data unit processing step may be configured as software.

In order to solve the above problems, in an embodiment of the present invention, as a communication terminal included in a multi-hop-based low-power wide area communication network to process communication packets, a first including a wake-up preamble and a data unit from another communication terminal. A wake-up preamble receiving step of receiving the wake-up preamble of one communication packet; A wakeup detection step of deriving a wakeup preamble detection value based on the wakeup preamble and preamble pattern data stored in the communication terminal, and generating a wakeup signal according to the wakeup preamble detection value; A data unit receiving step of waking up from a sleep state according to the wakeup signal and receiving a data unit of the first communication packet; And a data unit for decoding the MAC header included in the data unit received in the data unit receiving step, and processing the data unit based on reception address information included in the decoded MAC header and a routing table stored in the communication terminal. It provides a communication terminal for processing a communication packet to perform the processing step.

According to an embodiment of the present invention, the transmission power level of the transmission data to be transmitted to the corresponding other communication terminal is adjusted later based on the wakeup preamble detection value included in the ACK frame received from the other communication terminal. While considering, transmission data is transmitted at a minimum transmission power level, and the effect of reducing power consumption of a communication terminal can be exhibited.

According to an embodiment of the present invention, when an ACK frame for transmission data transmitted to another communication terminal is not received from a corresponding other communication terminal within a preset time, the transmission power level of the transmitted transmission data is gradually increased and retransmitted. Therefore, the effect of reducing the power consumption of the communication terminal can be exhibited.

According to an embodiment of the present invention, the wakeup preamble detection value corresponds to a value obtained by digitizing the correlation with the preamble pattern data previously stored in the communication terminal receiving the data, and the wakeup preamble detection value is a threshold value. If it is not exceeded, since the process for deriving the ACK frame by maintaining the sleep state is not performed, it is possible to reduce the power consumption of the corresponding communication terminal and at the same time reduce the load of the corresponding network.

According to an embodiment of the present invention, a wakeup preamble detection value transmitted immediately before is included in an ACK frame, and the wakeup preamble detection value is transmitted later by utilizing a received signal strength indicator (RSSI). Since the transmission data is transmitted at the minimum transmission power level that can be communicated by adjusting the transmission power level of the transmission data to be transmitted, the effect of reducing power consumption of the communication terminal can be exhibited.

According to an embodiment of the present invention, since the configuration for performing the ACK frame derivation step is configured in software, and is performed when the wakeup preamble detection value exceeds the threshold value, power consumption of the communication terminal can be reduced. , It can exert the effect that can reduce the manufacturing cost of communication terminal.

According to an embodiment of the present invention, since the MAC header included in the data part of the first communication packet is preferentially decoded, and it is determined whether to decode the entire data part according to the reception address information included in the decoded MAC header, the communication terminal It can exert the effect of reducing the computational amount of.

According to an embodiment of the present invention, when the reception address information of the decoded MAC header is not included in the routing table, the reception of the data unit is stopped and the data is switched back to the sleep state, so that the power of the communication terminal can be efficiently used. Can be exerted.

According to an embodiment of the present invention, the configuration for performing the wakeup detection step is configured in hardware, and the configuration for performing the data processing step is configured in software, so that computing power for processing communication packets in the communication terminal is provided. It can effectively provide and at the same time exhibit the effect of minimizing power consumption.

1 schematically shows a configuration of a low-power wide area communication network according to an embodiment of the present invention.
2 schematically shows steps performed when a communication terminal according to an embodiment of the present invention receives a response from another communication terminal.
3 schematically shows steps performed when a communication terminal according to an embodiment of the present invention does not receive a response from another communication terminal.
4 schematically illustrates steps of deriving a wakeup preamble detection value and deriving an ACK frame according to the wakeup preamble detection value according to an embodiment of the present invention.
5 schematically shows the configuration of an ACK frame according to an embodiment of the present invention.
6 schematically shows steps for adjusting a level of transmission power by receiving an ACK frame according to an embodiment of the present invention.
7 schematically shows a transmission power adjustment value according to each wake-up preamble detection section for adjusting a level of a transmission power according to an embodiment of the present invention.
8 schematically shows steps in which a communication terminal and another communication terminal perform communication to adjust a level of transmission power according to an embodiment of the present invention.
9 schematically shows steps of receiving and processing a first communication packet in a communication terminal according to an embodiment of the present invention.
10 schematically illustrates a method of deriving a wakeup preamble detection value according to an embodiment of the present invention.
11 schematically shows detailed steps of a data unit processing step according to an embodiment of the present invention.
12 schematically shows the configuration of a communication packet according to an embodiment of the present invention.
13 schematically shows the configuration of a communication terminal according to an embodiment of the present invention.

In the following, various embodiments and/or aspects are now disclosed with reference to the drawings. In the following description, for illustrative purposes, a number of specific details are disclosed to aid in an overall understanding of one or more aspects. However, it will also be appreciated by those of ordinary skill in the art that this aspect(s) may be practiced without these specific details. The following description and the annexed drawings set forth in detail certain illustrative aspects of the one or more aspects. However, these aspects are illustrative and some of the various methods in the principles of the various aspects may be used, and the descriptions described are intended to include all such aspects and their equivalents.

Further, various aspects and features will be presented by a system that may include multiple devices, components and/or modules, and the like. It is also noted that various systems may include additional devices, components and/or modules, and/or may not include all of the devices, components, modules, etc. discussed in connection with the figures. It must be understood and recognized.

As used herein, “an embodiment,” “example,” “aspect,” “example,” and the like may not be construed as having any aspect or design described as being better or advantageous than other aspects or designs. . The terms'~unit','component','module','system', and'interface' used below generally mean a computer-related entity, for example, hardware, hardware. It can mean a combination of software and software.

In addition, the terms "comprising" and/or "comprising" mean that the feature and/or component is present, but excludes the presence or addition of one or more other features, components and/or groups thereof. It should be understood as not doing.

In addition, terms including ordinal numbers such as first and second may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

In addition, in the embodiments of the present invention, unless otherwise defined, all terms used herein including technical or scientific terms are generally understood by those of ordinary skill in the art to which the present invention belongs. It has the same meaning as. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the embodiments of the present invention, an ideal or excessively formal meaning Is not interpreted as.

1. Communication terminal and method for automatically controlling transmission power based on low-power wide area communication network

As a communication method for efficiently using the power of a communication terminal in a low-power wide area communication network, after waking up by the received data as in the present invention, decoding a part of the received data, and determining whether to process the data. In addition to the data processing method, the power of the communication terminal can be efficiently used by optimizing the transmission power when transmitting data to the other communication terminal in the future according to the ACK from the other communication terminal that has received the data.

Therefore, prior to describing the method of processing data received by the communication terminal of the low-power wide area communication network of the present invention, a method of automatically controlling the transmission power in the communication terminal will be first described.

1 schematically shows a configuration of a low-power wide area communication network according to an embodiment of the present invention.

The network shown in FIG. 1 corresponds to a diagram showing a general type of network. In general, a low-power wide area communication network includes one or more communication terminals 100.1 and 100.2, one or more gateways 200.1, 200.2 and 200.3, a network server 300, and an application server (not shown). In general, an application server (not shown) finally receives data transmitted from the communication terminals 100.1 and 100.2, monitors or analyzes the data, and provides services to user terminals or other communication terminals.

Communication terminals (100.1, 100.2) correspond to sensors or actuators such as gas meters, parking sensors, asset trackers, environmental sensors, and smoke detectors, and collect and modulate data and transmit them to one or more gateways or other communication terminals. Play a role.

The gateways 200.1, 200.2, and 200.3 play a role of receiving and processing information transmitted from the communication terminals 100.1, 100.2, and then transmitting the information to the server 300, and transmits the information transmitted from the server 300 to the communication terminal ( 100.1, 100.2) or a response to the information received from the communication terminal (100.1, 100.2). On the other hand, the server 300 allows the communication terminals 100.1 and 100.2 to participate in the corresponding network and plays a role of efficiently operating the entire network.

The present invention relates to an operation process between subjects performing wireless communication in the network as described above, that is, communication between each communication terminal, or communication between a communication terminal and a gateway. In addition, in the present invention, since the gateway corresponds to a subject performing communication, it is considered to be included in the communication terminal. Therefore, in the present invention, a description will be given focusing on a process of performing communication between a communication terminal and another communication terminal and a configuration of the corresponding communication terminal.

On the other hand, the method of controlling the transmission power of the communication terminal and the method of processing communication packets in the communication terminal to be described later can be implemented in a communication terminal constituting a general low-power wide area communication network, but preferably, the communication distance is relatively long, It can be implemented in a communication terminal constituting a multi-hop-based low-power wide area communication network that is resistant to communication interference or interference by an obstacle. Data can be transmitted to the other communication terminal via the terminal.

2 schematically shows steps performed when a communication terminal according to an embodiment of the present invention receives a response from another communication terminal.

As shown in FIG. 2, as a low-power wide-area communication-based communication terminal 1000 that automatically controls transmission output, the communication terminal 1000 is when data is transmitted to another communication terminal 2000, the other communication terminal 2000 ) To transmit the transmission data including the first wake-up preamble (S10); and the communication terminal 1000 receives a response from the other communication terminal 2000 within a preset time. In this case, an ACK frame receiving step (S30) of receiving a first ACK frame including a first wake-up preamble detection value from the other communication terminal 2000 that is wake-up by receiving the transmission data; An output level adjustment step (S40) of adjusting the level of the transmission power based on the first wakeup preamble detection value; And a coordinated transmission data transmission step (S50) of transmitting the transmission data having the adjusted transmission power level to the other communication terminal (2000).

Specifically, the communication terminal 1000 performs a transmission data transmission step (S10) of transmitting transmission data to the other communication terminal 2000. In the transmission data transmission step (S10), the transmission data includes a first wake-up preamble. The first wake-up preamble allows the other communication terminal 2000 to wake up from a sleep state when receiving the first wake-up preamble. By transmitting the amble, the other communication terminal 2000 receiving the first wake-up preamble may synchronize timing in order to receive data to be actually transmitted.

Meanwhile, the other communication terminal 2000 receiving the transmission data, deriving a first wakeup preamble detection value, and deriving a first ACK frame based on the derived first wakeup preamble (S20). To do. The first wake-up preamble detection value corresponds to a value capable of verifying whether the transmission data is the data transmitted to the user. If the data transmitted to the user is correct, a part of the configuration or function of the communication terminal 1000 is performed. A communication terminal that wakes up in the sleep state, and the first wake-up preamble detection value corresponds to a value capable of determining a received signal strength (RSSI) at the same time, and receives a first ACK frame ( 1000), the level of the transmission power of the transmission data can be adjusted. Meanwhile, a method of deriving the wakeup preamble detection value will be described later.

In addition, the first ACK frame includes a separate wake-up preamble so that the communication terminal 1000 receiving the first ACK frame wakes up in a sleep state, and a communication terminal that transmits transmission data further including ACK data ( 1000) can determine whether the transmission data has been transmitted normally.

Meanwhile, the communication terminal 1000 that has transmitted the transmission data performs an ACK frame receiving step (S30) of receiving the first ACK frame from the other communication terminal 2000 that has been woken up. Thereafter, the communication terminal 1000 performs an output level adjustment step (S40) of adjusting the level of the transmission power based on the detected value of the first wakeup preamble included in the received first ACK frame. In the output level adjustment step (S40), the transmission data transmission step (S10) according to the transmission power adjustment value according to the section in which the first wakeup preamble detection value is included based on the mapping information previously stored in the communication terminal 1000. The above adjustment value is applied based on the transmission power level of the transmission data transmitted by. On the other hand, the adjustment value corresponds to a value that can be adjusted to the transmission power level of the minimum section in which communication can be normally performed in the other communication terminal 2000 that receives the transmission data. Preferably, the adjustment value is a negative number or zero. Correspondingly, the transmission power level previously transmitted can be reduced or maintained by the absolute value of the adjustment value.

Finally, a coordinated transmission data transmission step (S50) in which the communication terminal 1000 transmits transmission data having a level of transmission power adjusted to the corresponding other communication terminal 2000 transmitted in the transmission data transmission step (S50) is performed. The transmission data transmitted in the coordinated transmission data transmission step (S50) is preferably transmission data to be transmitted later, separate from the transmission data transmitted in the transmission data transmission step (S10).

Therefore, according to an embodiment of the present invention, when separate transmission data is transmitted from the communication terminal 1000 by performing the above steps, transmission data having a minimum transmission power level capable of performing communication normally is transmitted. Therefore, the effect of reducing the power consumption of the communication terminal 1000 can be exhibited.

3 schematically shows steps performed when a communication terminal according to an embodiment of the present invention does not receive a response from another communication terminal.

As shown in FIG. 3, when the communication terminal 1000 does not receive a response from the other communication terminal 2000 within a preset time, the transmission output of the transmission data transmitted in the transmission data transmission step The transmission data retransmission step of retransmitting the transmission data to the other communication terminal 2000 by increasing the level is performed.

On the other hand, in the transmission data retransmission step, the transmission power level of the transmission data is increased by one higher than the transmission power level of the transmission data transmitted in the transmission data transmission step, and retransmission is performed, and from the other communication terminal 2000 When a response to the retransmitted transmission data is not received within a preset time, the transmission power level of the transmission data is increased by one step and retransmitted.

Specifically, as in the transmission data transmission step (S10) described above in FIG. 2, the communication terminal 1000 transmits the transmission data including the first wakeup preamble to the other communication terminal 2000 (S60). Carry out. Thereafter, the communication terminal 1000 performs a waiting step (S70) to receive the first ACK frame from the transmitted other communication terminal 2000. Specifically, the step S70 waits for a preset time, and if the first ACK frame is not received for a preset time, the following step S80 is performed.

When the communication terminal 1000 fails to receive the first ACK frame from another communication terminal 2000, the communication terminal 1000 performs a step (S80) of increasing the transmission power level by one step from the transmission power level in the step of transmitting the transmission data (S60). . More specifically, the transmission power level in the step of transmitting the transmission data (S60) may be increased by 1 dBm, and the degree of increase may be different according to a preset increase value. Subsequently, the communication terminal 1000 performs a transmission data retransmission step (S90) of retransmitting the transmission data whose transmission power level is increased by one step to the other communication terminal 2000.

After transmitting the transmission data whose transmission power level is increased by one step through the transmission data retransmission step (S90), the communication terminal 1000 again receives the first ACK frame from the other communication terminal 2000 for a preset time. The waiting step (S100) is performed. In the case of receiving the first ACK frame from the other communication terminal 2000 for a predetermined time, as in FIG. 2, the communication terminal 1000 includes an output level adjustment step (S40) and a coordinated transmission data transmission step (S50). You can do it.

On the other hand, when the first ACK frame is not received again from the other communication terminal 2000 for a preset time, a step (S110) of further increasing the transmission power level of the transmission data is performed. More specifically, it is possible to increase the transmission power level by 1 dBm more than the transmission power level of the increased transmission data by performing the step (S80) of increasing the transmission power level by one step from the step of transmitting the transmission data (S60), and increasing it by another step. If so, the degree of increase according to the preset increase value may be different.

Next, the communication terminal 1000 performs a step (S120) of retransmitting the transmission data whose transmission power level is increased by one step to the other communication terminal 2000 (S120), and receives a first ACK frame from the other communication terminal 2000. In order to receive, the process of retransmitting to the other communication terminal 2000 may be repeated by gradually increasing the level of the transmission power as described above. Preferably, in order to receive the first ACK frame, the above process may not be infinitely repeated, and the above process may be repeated for a preset number of times or for a preset time.

Therefore, according to an embodiment of the present invention, when the communication terminal 1000 fails to receive an ACK from another communication terminal 2000, the level of the transmission power is increased and retransmitted in stages, so the consumption of the communication terminal 1000 The effect of reducing power can be exerted.

4 schematically illustrates steps of deriving a wakeup preamble detection value and deriving an ACK frame according to the wakeup preamble detection value according to an embodiment of the present invention.

As shown in Figure 4, the communication terminal 1000, when receiving data from another communication terminal 2000, receiving data for receiving received data including a second wake-up preamble from the other communication terminal 2000 Receiving step (S130); A second wakeup preamble detection value is derived based on the second wakeup preamble included in the received data and the preamble pattern data previously stored in the communication terminal 1000, and the second wakeup preamble detection value A wake-up detection step of generating a wake-up signal according to the method; An ACK frame derivation step (S180) of waking up in a sleep state according to the wakeup signal and deriving a second ACK frame based on the derived second wakeup preamble detection value (S180); And an ACK frame transmitting step of transmitting the second ACK frame to the other communication terminal 2000.

Specifically, in FIGS. 2 and 3, a process of transmitting transmission data from the communication terminal 1000 to another communication terminal 2000 and receiving an ACK frame according to the transmission data from the other communication terminal 2000 has been described. , In FIG. 4, a description will be given of a process in which the communication terminal 1000 receives received data from another communication terminal 2000 and derives an ACK frame according to the received data.

The communication terminal 1000 performs a reception data reception step (S130) of receiving reception data from another communication terminal 2000. The received data includes a second wakeup preamble, and the communication terminal 1000 derives a second wakeup preamble detection value based on the second wakeup preamble, and the second wakeup preamble The response data (ACK) informing that the received data has been received is transmitted to the corresponding other communication terminal 2000 according to the Mble detection value. On the other hand, the second wake-up preamble does not have a functional or configuration difference from the first wake-up preamble described in FIG. ), the wakeup preamble included in the transmission data transmitted to the first wakeup preamble is specified as the first wakeup preamble, and the wakeup preamble included in the received data received from the other communication terminal 2000 is determined by the communication terminal 1000. 2 It is specified as a wake-up preamble. Similarly, the first wake-up preamble detection value, the second wake-up preamble detection value, and the first and second ACK frames also correspond to those specified arbitrarily for ease of explanation.

The communication terminal 1000 performs a step (S140) of deriving a second wakeup preamble detection value for the second wakeup preamble of the received data. The second wakeup preamble detection value is derived based on the preamble pattern data pre-stored in the communication terminal 1000 and the received second wake-up preamble, and more specifically, the preamble pattern data pre-stored It may correspond to the unique preamble pattern data of the communication terminal 1000, and the second wakeup preamble detection value quantifies the correlation between the second wakeup preamble and the preamble pattern data. It corresponds to one value.

Accordingly, the second wake-up preamble detection value can perform a function of checking whether data targeted for communication is correct according to its size, and simultaneously perform a function of determining the strength of a received signal.

Meanwhile, a step (S150) of deriving the second wakeup preamble detection value and comparing the second wakeup preamble detection value with a threshold value previously stored in the communication terminal 1000 is performed. When the second wake-up preamble detection value does not exceed the threshold value by performing the step (S150), the communication terminal 1000 determines that the received received data is not data intended for itself, or , It is judged that the data targeting itself or the transmission power level is low, so that the data cannot be received normally. Therefore, without deriving the second ACK frame, a step (S160) of continuously maintaining the function or unit for deriving the second ACK frame in the sleep state is performed. In addition, the above-described threshold value may be pre-stored in each communication terminal 1000 as a different value according to the configuration and characteristics of each communication terminal 1000.

Accordingly, when the second wake-up preamble detection value does not exceed the threshold value, the function or unit for deriving the ACK frame is not wake-up, so that the power consumption of the communication terminal 1000 can be reduced.

Meanwhile, when the second wakeup preamble detection value exceeds the threshold value in the step of comparing the second wakeup preamble detection value and the threshold value (S150), the communication terminal 1000 receives In order to determine that the received data has been normally received and to derive a second ACK frame for transmission to another communication terminal 2000, a wake-up signal is generated to wake up the function or unit for deriving the second ACK frame, and the A step (S170) of waking up a function or unit for deriving a second ACK frame based on the wake-up signal from the sleep state is performed.

On the other hand, if the function for deriving the second ACK frame or additional hardware is configured, the corresponding hardware is driven based on the wakeup signal, and if the software is configured, the software is executed based on the wakeup signal or Can be called.

Subsequently, the step of deriving the ACK frame (S180) is based on a second wake-up preamble detection value for the second wake-up preamble most recently received from the other communication terminal 2000 to which the second ACK frame is to be transmitted. Thus, a second ACK frame can be derived.

Specifically, the function or unit for deriving the wake-up second ACK frame performs an ACK frame derivation step (S180) of deriving a second ACK frame based on the derived second wake-up preamble detection value. More specifically, the derived second ACK frame includes the second wake-up preamble detection value, a preamble for waking up the other communication terminal 2000 from the sleep state, and the received from the other communication terminal 2000. It further includes ACK data for the received data.

Meanwhile, the second wake-up preamble detection value derived in the step (S140) of deriving the second wake-up preamble detection value is stored in a separate storage unit (not shown) of the communication terminal 1000, In the ACK frame deriving step (S180), the pre-stored second wakeup preamble detection value may be loaded and included in the second ACK frame. In addition, since the second wakeup preamble detection value may be different according to the network environment at the time of receiving the received data from the corresponding other communication terminal 2000, the most recently derived second wakeup preamble detection value is It may correspond to a value that reflects the current network environment well. Therefore, in the ACK frame deriving step (S180), the second wakeup preamble detection value included in the second ACK frame is received from the corresponding other communication terminal 2000, and each second wake according to one or more second wakeup preambles. It may be a second wake-up preamble detection value derived most recently among the up preamble detection values.

Meanwhile, the steps shown in FIG. 4 include deriving a second wakeup preamble detection value for received data received from another communication terminal 2000 in the communication terminal 1000, and thus deriving a second ACK frame. In the same manner, when the other communication terminal 2000 receives the transmission data transmitted from the communication terminal 1000, and the communication terminal 1000 receives the first ACK frame for the transmission data from the other communication terminal 2000, The first ACK frame includes a first wakeup preamble detection value.

The first wake-up preamble detection value is derived based on the first wake-up preamble included in the transmission data and the preamble pattern data previously stored in another communication terminal 2000 that has received the transmission data, and the second The 1ACK frame may be generated when the first wakeup preamble detection value exceeds a preset threshold.

5 schematically shows the configuration of an ACK frame according to an embodiment of the present invention.

The first and second ACK frames described in the present invention correspond to the addition of the first and second descriptions for ease of description, and the configurations included in the first and second ACK frames are the same, Therefore, in FIG. 5, the ACK frame 3000 and the configuration included in the ACK frame 3000 will be collectively described.

The ACK frame 3000 includes a preamble 3100, a wakeup preamble detection value 3200, and ACK data 3300. The preamble 3100 wakes up the receiving side communication terminal receiving the ACK frame, and synchronizes the receiving side communication terminal to receive data normally.

The wake-up preamble detection value 3200 corresponds to a value derived based on the wake-up preamble received from the communication terminal transmitting the data of the ACK frame 3000 and the preamble pattern data of the communication terminal receiving the data. In addition, the communication terminal receiving the ACK frame 3000 may adjust the transmission power level based on the wakeup preamble detection value 3200 included in the ACK frame 3000.

Finally, the ACK data 3300 corresponds to response data that receives data in a general communication network and transmits it to a receiving communication terminal. Accordingly, the ACK data 3300 may include information indicating that a message has been normally received without an error.

Accordingly, the ACK frame 3000 includes the preamble 3100 and wakes up the receiving side communication terminal receiving the ACK frame 3000 to reduce power consumption of the receiving side communication terminal, and the ACK frame 3000 A wakeup preamble detection value 3200 may be further included, and the reception side communication terminal receiving the ACK frame 3000 may adjust the transmission power level of the data to be transmitted later.

6 schematically shows steps for adjusting a level of transmission power by receiving an ACK frame according to an embodiment of the present invention.

As shown in FIG. 6, the output level adjustment step (S200) includes the first wake-up free based on a transmission power adjustment value according to each wake-up preamble detection section previously stored in the communication terminal 1000. The level of the transmission power can be adjusted according to the transmission power adjustment value corresponding to the Mble detection value.

Specifically, the output level adjustment step (S200) is based on the first wake-up preamble detection value included in the first ACK frame received through the step (S190) of receiving a first ACK frame from another communication terminal (2000). It can be done by doing. Meanwhile, when a second ACK frame is derived from the communication terminal 1000 and transmitted to the other communication terminal 2000, the second wake-up preamble detection value included in the second ACK frame is also applied to the other communication terminal 2000. Based on the output level adjustment step may be performed.

In the communication terminal 1000 receiving the first ACK frame, intervals of one or more wakeup preamble detection values and an adjustment value of the transmission power level according to each interval are previously stored, and thus the communication terminal 1000 outputs the The transmission power level of the transmission data to be transmitted to the other communication terminal 2000 can be adjusted later according to the adjustment value of the section including the first wakeup preamble detection value received by performing the level adjustment step (S200). have.

Meanwhile, the adjustment value corresponds to a correction value capable of correcting the transmission power level of previously transmitted transmission data, and preferably, when the first wakeup preamble detection value exceeds the threshold value, the first ACK frame is When receiving, that is, when the transmission power level of the transmission data is higher than the minimum transmission power level for normal communication, the first ACK frame is received, so the adjustment value does not adjust the transmission power level or decreases the transmission power level. It can be configured in a form.

7 schematically shows a transmission power adjustment value according to each wake-up preamble detection section for adjusting a level of a transmission power according to an embodiment of the present invention.

As shown in FIG. 7, in each communication terminal, a range of a wakeup preamble detection value is pre-stored in one or more steps, and an adjustment value of a transmission power level corresponding to each step is pre-stored.

Meanwhile, as described above, when the wakeup preamble detection value exceeds the threshold value, the ACK frame can be received and the transmission power level can be adjusted. In FIG. 7, 511 corresponds to the threshold value, and is included in the ACK frame. The wakeup preamble detection value may be 512 as the minimum value, and the total number of bits of the wakeup preamble may be the maximum value. In FIG. 7, since the total number of bits of the wakeup preamble is 4096, the wakeup preamble detection value is set to a maximum value of 4096. In addition, a range from a minimum value to a maximum value of the wakeup preamble detection value exceeding the threshold value may be divided into one or more steps, and an adjustment value of the transmission power level may be allocated for each step.

The total number of steps or the size of the range of each step can be set differently for each communication terminal according to the characteristics of the communication terminal, and similarly, the adjustment value of the transmission power level assigned to the corresponding step is also different for each communication terminal. Can be set.

On the other hand, in FIG. 7, a section is set in a total of four steps, and adjustment values of the transmit power levels of -3dBm, -2dBm, -1dBm, and 0dBm are allocated sequentially from step 1. Therefore, it is assumed that the transmission power level of the previously transmitted transmission data is NdBm, and if the received wakeup preamble detection value is included in step 4, it is included within the range of the minimum transmission power level that can be communicated normally. Without it, the transmission power level of the transmission data transmitted to the other communication terminal is transmitted in NdBm.

On the other hand, if the received wake-up preamble detection value is included in step 2, since the adjusted value of the transmit power level assigned to step 2 is -2 dBm, the transmit power level is adjusted to (N-2) dBm, and then the corresponding The transmission power level of the transmission data transmitted to other communication terminals is set to (N-2)dBm.

As described above, according to an embodiment of the present invention, the transmission power level of the transmission data to be transmitted later based on the wakeup preamble detection value for the transmission data transmitted previously is the transmission power level within the minimum range in which normal communication is possible. As it can be adjusted and transmitted, the effect of reducing the power consumption of the communication terminal can be exerted.

8 schematically shows steps in which a communication terminal and another communication terminal perform communication to adjust a level of transmission power according to an embodiment of the present invention.

The diagram shown in FIG. 8 is the same as the steps shown in FIG. 2 described above, but in FIG. 8, the transmission output is based on the transmission power level of the transmission data transmitted from the communication terminal 1000 to the other communication terminal 2000. It corresponds to a diagram showing the process of adjusting the level.

Specifically, the communication terminal 1000 performs a step S220 of transmitting transmission data including the first wake-up preamble and message data to be transmitted to the other communication terminal 2000. The transmission data transmitted in the step S220 is transmitted to the other communication terminal 2000 by setting the transmission power level to NdBm.

Subsequently, the other communication terminal 2000 receiving the transmission data derives a first wakeup preamble detection value based on the first wakeup preamble included in the transmission data, and detects the first wakeup preamble. When the value exceeds the threshold value, the step of generating a first ACK frame (S230) is performed. In the first ACK frame, a first wake-up preamble detection value derived in a corresponding step (S230), a separate wake-up preamble to synchronize and wake-up the communication terminal 1000 receiving the first ACK frame, and the transmission Contains ACK data indicating that data has been normally received. The other communication terminal 2000 transmits the generated first ACK frame to the communication terminal 1000 that transmitted the transmission data (S240).

Meanwhile, the communication terminal 1000 receiving the first ACK frame performs a step (S250) of adjusting the transmission power level transmitted in NdBm based on the detected value of the first wakeup preamble included in the first ACK frame. . In the corresponding step (S250), as shown in FIG. 8, the first wakeup preamble detection value is included in the wakeup preamble detection range corresponding to the second step, and thus the transmission power level of NdBm is adjusted according to the corresponding adjustment value. By reducing it by 2dBm, the transmit power level is adjusted to (N-2)dBm as a result.

Afterwards, if separate transmission data is to be transmitted from the communication terminal 1000 to the other communication terminal 2000, the corresponding transmission data is set to the previously adjusted (N-2) dBm as the transmission power level, and the corresponding other communication terminal (2000) To perform the step of transmitting (S260). The other communication terminal 2000 that has received the separate transmission data derives a first wakeup preamble detection value for the first wakeup preamble included in the separate transmission data as in the above-described step (S230), When the detection value exceeds the threshold value, the step of generating the first ACK frame (S270) is performed. The corresponding step S270 may be performed when additional transmission data is newly received even if transmission data has been previously received from the same communication terminal 1000. Accordingly, the first ACK frame may include a first wake-up preamble detection value of the most recently received transmission data. Subsequently, the other communication terminal 2000 transmits the derived first ACK frame to the communication terminal 1000 that has transmitted separate transmission data (S280).

Finally, the communication terminal 1000 receiving the first ACK frame performs a step (S290) of adjusting the transmission power level again based on the detected value of the first wake-up preamble included in the first ACK frame. As shown in Fig. 8, the first wake-up preamble detection value is included in the wake-up preamble detection range corresponding to step 4, and thus the previously adjusted transmission power level of (N-2) dBm is adjusted accordingly. Since it is not separately adjusted according to the value, as a result, the transmit power level is maintained at (N-2) dBm.

As described above, as in the exemplary embodiment of the present invention, the communication terminal 1000 receives the first wakeup preamble detection value from the other communication terminal 2000 that has received the transmission data each time it transmits the transmission data and outputs the transmission. Since the level is continuously adjusted to the minimum transmission power level range for normal communication, an effect of reducing power consumption of the communication terminal 1000 can be exhibited.

2. Low-power wide area communication network based Communication packet Communication terminal and method to process

'1. In'Communication terminal and method for automatically controlling transmission power based on a low-power wide area communication network', ACK frames are received from other communication terminals that have received data from the communication terminal in order to minimize the power consumption of the communication terminal constituting the low-power wide area communication network In addition, a method of adjusting the transmission power when data is subsequently transmitted to the other communication terminal based on the wakeup preamble detection value included in the ACK frame has been described.

Separately, in order to minimize the power consumption of the communication terminal, the communication terminal that has received data decodes a part of the received data and determines whether the data is processed, and then the power consumption required to process the data through the method of processing the data. Can be minimized. Therefore, hereinafter, a method of processing the data by waking up in the communication terminal that has received the data will be described.

Meanwhile, '1. In the'Communication terminal and method for automatically controlling the transmission power based on a low-power wide area communication network', the transmission data and the reception data are respectively used in order to facilitate explanation of the case of transmitting data and the case of receiving data from the communication terminal. Although described separately, a description will be given of a process in which the communication terminal receives data from other communication terminals and processes the received data. Therefore, the first communication packet described below may correspond to the above-described received data, and similarly, the wakeup preamble and wakeup preamble detection values described below are the second wakeup preamble included in the above-described received data. And a second wakeup preamble detection value derived based on the second wakeup preamble.

9 schematically shows steps of receiving and processing a first communication packet in a communication terminal according to an embodiment of the present invention.

9, a communication packet processing method in a communication terminal of a multi-hop-based low-power wide area communication network, wherein the wake-up preamble of a first communication packet including a wake-up preamble and a data unit from another communication terminal A wake-up preamble receiving step of receiving (S300); A wakeup detection step of deriving a wakeup preamble detection value based on the wakeup preamble and preamble pattern data stored in the communication terminal, and generating a wakeup signal according to the wakeup preamble detection value ( S310 to S330); A data unit receiving step (S340) of waking up from a sleep state according to the wakeup signal and receiving a data unit of the first communication packet; And a data unit for decoding the MAC header included in the data unit received in the data unit receiving step, and processing the data unit based on reception address information included in the decoded MAC header and a routing table stored in the communication terminal. Processing step (S350); may include.

Specifically, the process from the wake-up preamble receiving step (S300), the wake-up detection steps (S310 to S330), and the data unit receiving step (S340) shown in FIG. 9 to wake-up is described in step S130 of FIG. 4. It may correspond to step S170.

First, the communication terminal performs a wake-up preamble receiving step (S300) of receiving a wake-up preamble included in the first communication packet from another communication terminal. The first communication packet includes a wake-up preamble, and more specifically, the wake-up preamble is located at the front end (header) of the first communication packet, so that the first communication from another communication terminal in the communication terminal. When receiving a packet, the wakeup preamble may be preferentially received.

Subsequently, the communication terminal performs wake-up detection steps (S310 to S330) of generating a wake-up signal based on the received wake-up preamble. More specifically, the wakeup detection step (S310 to S330) is a wakeup preamble based on the wakeup preamble received in the wakeup preamble reception step (S300) and the preamble pattern data previously stored in the communication terminal. A detection value is derived, and a wakeup signal is generated according to the wakeup preamble detection value.

More specifically, the preamble pattern data may correspond to preamble pattern data unique to a communication terminal, and in the wakeup detection steps (S310 to S330), the wakeup preamble and the preamble included in the first communication packet A wake-up preamble detection value corresponding to a value obtained by quantifying the correlation of the emble pattern data is derived.

Meanwhile, in the wakeup detection steps (S310 to S330), whether to generate a wakeup signal may be determined according to a result of comparing the derived wakeup preamble detection value with a preset threshold value in the communication terminal. More specifically, when the wakeup preamble detection value derived in step S310 exceeds a preset threshold, the communication terminal determines that the first communication packet is normally being received or is being received, and generates a wake-up signal in step S320. , The generated wakeup signal may convert a module or unit that performs a function of processing the data unit by receiving the data unit of the first communication packet to be described later to the wakeup state.

On the other hand, when the wakeup preamble detection value is less than a preset threshold, the communication terminal determines that the received first communication packet is not a packet intended for itself, or the transmission power level is low, so that the packet is normally received. It is judged that it was not possible. Accordingly, in the wakeup detection step, the sleep state of the module or the unit performing a function of processing the data unit by receiving the data unit of the first communication packet is maintained as it is without generating a wakeup signal (S330).

In the data unit receiving step (S340), the data unit is awakened by the generated wake-up signal to receive a data unit further included in the first communication packet, and in the data unit processing step (S350), in the data unit receiving step (S340) The MAC header included in the received data unit is decoded, and the data unit is processed based on reception address information included in the decoded MAC header and a routing table stored in the communication terminal.

More specifically, in the data unit processing step (S350), it is determined whether the data unit is processed based on the reception address information included in the decoded MAC header and the routing table, and even when it is determined to be processed, the reception address information is It is possible to determine whether to decode the entire data unit according to whether the address corresponds to the communication terminal. Meanwhile, since a MAC header is located at the front end (header) of the data unit, the MAC header may be preferentially received when the data unit is received.

As described above, in the data unit processing step (S350), the entire data unit is decoded to determine whether or not the data unit is processed, but only the MAC header included in the data unit is decoded to determine whether the entire data unit is processed. It can exert the effect of efficiently using the computing power of.

Meanwhile, in another embodiment of the present invention, the communication terminal continuously receives a first communication packet including a wake-up preamble and a data unit, and sequentially receives the first communication packet. The wake-up preamble located at the front end is received first. In the wakeup detection step, a wakeup signal is generated by deriving a wakeup preamble detection value based on the received wakeup preamble, and the data unit receiving step (S340) is omitted and the generated wakeup signal The data part processing step (S350) is converted to a module or additional wake-up state, and as the first communication packet is sequentially received, the data part is processed by decoding the MAC header of the data part to be received following the wake-up preamble. You can also determine whether or not.

10 schematically illustrates a method of deriving a wakeup preamble detection value according to an embodiment of the present invention.

As shown in FIG. 10, in the wake-up detection step, XNOR each of the one or more detailed data included in the preamble pattern data and the corresponding detailed data included in the wake-up preamble of the first communication packet. The sum of the calculated values derived by calculation may be derived as the wakeup preamble detection value.

Specifically, the wakeup preamble detection value may correspond to the first wakeup preamble detection value and the second wakeup preamble detection value described above. The wakeup preamble detection value corresponds to a value obtained by quantifying a correlation between mutual data based on the wakeup preamble included in the first communication packet and the preamble pattern data previously stored in the communication terminal.

Meanwhile, in order to derive a correlation between the mutual data, an XNOR operation may be performed on the mutual data. The XNOR operation corresponds to an operation of outputting 1 when two input values are the same, and outputting 0 when two input values are different. More specifically, an XNOR operation is performed on one or more detailed data of the wakeup preamble and one or more detailed data of the corresponding preamble pattern data, and the sum of the results of the XNOR operation for each detailed data is used as the wakeup preamble detection value. can do. Preferably, the wake-up preamble and the preamble pattern data are digital signals, and the sum of the calculated values derived by XNOR operation of the sample value of the wake-up preamble and the sample value of the corresponding preamble pattern data is the wake-up preamble. It can be set as the up preamble detection value.

On the other hand, the wakeup preamble detection value derived through the above operation is compared with a pre-stored threshold value, and when the threshold value is exceeded, a wakeup to wake up the module or unit performing the data unit receiving step (S340) An up signal may be generated, and as described above, a wakeup signal for waking up a function or a unit for deriving the ACK frame may be generated in order to derive the ACK frame.

Preferably, when the threshold value is exceeded, a wakeup signal is generated to wake up the module or unit performing the data unit receiving step (S340), and the step of deriving the ACK frame after processing the data unit is performed. Alternatively, steps of generating a wakeup signal to wake up a module or a unit that performs a function of deriving the ACK frame, and receiving and processing the data unit after deriving and transmitting the ACK frame may be performed.

The wakeup preamble detection value corresponds to a degree of correlation between the wakeup preamble and the preamble pattern data. In addition, when the transmission power level of the received first communication packet is low and noise is generated in the wake-up preamble and cannot be received normally, the wake-up preamble detection value does not exceed the threshold value, and thus the data unit is not received and processed. Alternatively, the ACK frame corresponding to the first communication packet is not generated. Meanwhile. As described above, the transmitting side that has not received the ACK frame, that is, another communication terminal, can retransmit by increasing the transmission power level of the first communication packet by one step.

11 schematically shows detailed steps of a data unit processing step according to an embodiment of the present invention.

As shown in FIG. 11, in the data unit processing step, when the reception address information of the decoded MAC header corresponds to a communication terminal that has received the data unit, the entire data unit is decoded and the decoded data unit is A data portion decoding step (S420) provided to an upper layer; When the reception address information of the decoded MAC header does not correspond to the communication terminal receiving the data unit and the reception address information is included in the routing table, a second data unit including the data unit received in the data unit receiving step A second communication packet transmission step (S470) of transmitting the communication packet to another communication terminal corresponding to the reception address information and the routing table; And a sleep state switching step (S440) of stopping reception of the data unit and switching from a wake-up state to a sleep state when the reception address information of the decoded MAC header is not included in the routing table (S440). have.

Specifically, in the data unit processing step, only the MAC header included in the data unit of the first communication packet received in the data unit receiving step is decoded (S400). Thereafter, in the data part processing step, it is determined whether information on the broadcast mode is included in the decoded MAC header (S410). More specifically, the decoded MAC header includes reception address information, and when the reception address information corresponds to information on the broadcast mode, the communication terminal needs to process the data unit, so the data unit processing In step S420, the entire received data unit is decoded and provided to an upper layer. More specifically, the layer may correspond to a communication layer that is generally classified, such as an OSI 7 layer, and the upper layer may correspond to a specific layer that processes a decoded data unit.

Meanwhile, when the decoded MAC header does not include information on a broadcast mode, the data unit processing step may perform additional predetermined steps for processing a data unit to be described later.

As shown in FIG. 11, in the data unit processing step, when Time to Live information further included in the decoded MAC header is less than or equal to a preset value, reception of the data unit is stopped and a wake-up state is performed. And a sleep state conversion step (S440) of converting to a sleep state in FIG.

Specifically, in the data section processing step, when the decoded MAC header does not contain information on a broadcast mode, the data section is processed according to whether life time information included in the decoded MAC header is valid. When the first communication packet is transmitted, a preset value is assigned to the life time information, and each node decreases the value assigned to the life time information as it passes more than one node like a router in multi-hop-based communication. It sends to the next node. On the other hand, when the value assigned to the life time information decreases sequentially and becomes 0, the node receiving the communication packet including the life time information having a value of 0 does not process the corresponding communication packet, so that the corresponding communication packet is transferred to the network. By not processing it in the network, you can prevent the continuous increase in network traffic.

Accordingly, in the data part processing step, it is determined whether the life time information included in the decoded MAC header is valid, that is, whether the value of the life time information is less than a preset value (S430), and the life time information is valid. If not, if the data unit is being received, the reception of the data unit is stopped, and a sleep state conversion step (S440) is performed in which the module or unit that performs the data unit processing step is converted to a sleep state again.

Therefore, when the communication terminal receives a communication packet containing invalid life time information, the module or unit that performs the data processing step switches from the wake-up state to the sleep state again, so that the power of the communication terminal is efficiently reduced. The effect that can be used can be exhibited.

On the other hand, when the life time information exceeds a preset value, that is, when the life time information is valid, the data unit processing step is performed to determine whether the reception address information included in the decoded MAC header corresponds to the communication terminal receiving the data unit. When it is determined (S450), and it is determined that the reception address information included in the decoded MAC header corresponds to the communication terminal, the communication terminal performs the above-described data copy decoding step in order to process the received data unit in an upper layer. Perform (S420).

On the other hand, when it is determined that the reception address information included in the decoded MAC header does not correspond to the communication terminal, the communication terminal determines whether the corresponding reception address information is included in the routing table stored in the communication terminal. Discriminate (S460).

In the routing table stored in the communication terminal, the address information of each communication terminal included in the network is used as a destination, and the communication packet is transmitted (hopping) from the corresponding communication terminal to arrive for each communication terminal corresponding to the destination. It contains address information for the next node that needs to be done. Accordingly, the fact that the reception address information included in the decoded MAC header is included in the routing table means that the first communication packet received by the corresponding communication terminal must arrive to another communication terminal included in the network.

When the receiving address information included in the MAC header decoded in step S460 is not included in the routing table, the data unit processing step is a sleep state conversion step of stopping reception of the data unit and switching from a wake-up to a sleep state ( S440) is performed. That is, if the received address information of the first communication packet does not correspond to its own address information and is not included in the routing table, the received first communication packet corresponds to a packet that does not need to be processed in the corresponding network. By stopping the reception and switching back to the sleep state, it is possible to reduce the power consumption of the corresponding communication terminal.

On the other hand, when it is determined in step S460 that the receiving address information is included in the routing table, the data unit processing step generates a second communication packet including the received data unit, and corresponds the second communication packet to the routing table. A second communication packet transmission step (S470) to be transmitted to another communication terminal is performed.

In the second communication packet transmission step (S470), when reception of the data unit is in progress, the reception of the data unit is completed, and in the second communication packet transmission step (S470), the first communication packet is transmitted by the corresponding communication terminal. It does not process as a method, but transfers (hopping) the received first communication packet to the next node based on the routing table, so if the decoding of the data part is in progress, the decoding is stopped and only the reception of the data part is performed. . Meanwhile, the second communication packet generated in the second communication packet transmission step (S470) may include a payload of the first communication packet and a MAC header or a wake-up preamble separately generated by the communication terminal. In addition, the second communication packet may be transmitted to a specific other communication terminal based on a routing table stored in the corresponding communication terminal. More specifically, the second communication packet may be transmitted to a specific other communication terminal corresponding to address information for a next node corresponding to the receiving address information included in the first communication packet in the routing table.

In this way, in the data part processing step, in order to process the data part based on the routing table stored in the communication terminal, the network may be implemented in a static routing method in which a communication path is fixed. It can also be set by the administrator.

12 schematically shows the configuration of a communication packet according to an embodiment of the present invention.

As shown in FIG. 12, a communication packet including a first communication packet transmitted and received in a network includes a wake-up preamble and a data unit. As described above, the wakeup preamble may derive a wakeup preamble detection value based on the wakeup preamble in a communication terminal receiving a communication packet, and wake up according to the wakeup preamble detection value. have.

Meanwhile, the data unit includes a MAC header and a payload. The payload substantially corresponds to data to be communicated, and may correspond to data that is not changed when a communication packet is transmitted through one or more nodes in a multi-hop method. The MAC header may be received in a wake-up data unit receiving step according to a wakeup preamble detection value, and a processing method of the data unit may be determined by decoding the MAC header in the data unit processing step. The MAC header includes information that enables the communication packet to be transmitted normally, and specifically, may include transmission address information, reception address information, life time information, and sequence number information.

The transmission address information corresponds to address information of the communication terminal that initially transmitted the communication packet, and the transmission address information may be omitted.

The receiving address information corresponds to the address information of the communication terminal to which the communication packet must arrive, and the communication terminal corresponding to the node that has received the communication packet is the next node or arrival based on the transmission address information and the stored routing table. A separate communication packet including the payload can be transmitted to the communication terminal to be performed.

The life time information (Time to Live, TTL) is information indicating the validity period of a communication packet, and when the first communication packet is generated, the life time information has a preset value, and as the communication packet passes through a node, each At the node of, the value of the life time information is sequentially decreased. Therefore, when the communication packet is transmitted as many as the number of nodes corresponding to a preset value, the life time information becomes 0, and the communication terminal including the life time information having a value of 0 indicates that the corresponding communication packet is not valid. By discriminating, the communication packet is not processed.

In the present invention, when it is determined that the life time information is not valid, consumption of the communication terminal through a module that performs a step of receiving or processing a data unit in the communication terminal or a sleep state conversion step (S440) that switches to an additional sleep state. The effect of reducing power can be exerted.

The sequence number information corresponds to information indicating an order of communication packets in the case of transmitting data to be transmitted through a plurality of communication packets. Accordingly, a communication terminal that finally receives the plurality of communication packets can determine the order of the plurality of communication packets through the sequence number information.

13 schematically shows the configuration of a communication terminal according to an embodiment of the present invention.

As shown in FIG. 13, the configuration for performing the wakeup detection step is configured in hardware to perform only the wakeup detection step, and the configuration for performing the ACK frame deriving step and the data unit processing step is software-based. It can be composed of.

Specifically, the communication terminal 1000 includes an RF unit 1100, a wake-up detection unit 1200, and a control unit 1300. The RF unit 1100 may convert and transmit digital data to be transmitted through a wireless communication method, and may receive a signal to be received and convert it into digital data. In addition, the RF unit 1100 may include an antenna to transmit and receive information, and the antenna may transmit or receive a signal in a frequency band generally used in low power wide area communication. Preferably, in the case of low-power wide-area communication implemented in a dedicated network method such as Sigfox or LoRa, it transmits and receives signals in the 900 MHz band, which is an unlicensed band, and in the case of low-power wide-area communication implemented in a non-private network method such as LTE-M or NB-IoT, a license It can transmit and receive signals in the 1.4MHz or 200KHz band of the LTE frequency band.

Meanwhile, the wake-up detection unit 1200 derives a wake-up preamble detection value based on the wake-up preamble of the first communication packet received from the RF unit 1100, and stores the wake-up preamble detection value. Compared with the value, when the threshold value is exceeded, a wake-up signal is generated. In addition, the wakeup detection unit 1200 may include a separate storage unit (not shown) to store the derived wakeup preamble detection value. In addition, when the wakeup detection unit 1200 receives the first communication packet from the RF unit 1100, the wakeup preamble detection value must be immediately derived and a number of calculations must be performed. Therefore, the wakeup detection unit 1200 may be configured in hardware.

The control unit 1300 maintains a sleep state during normal times, and wakes up from the sleep state when the wakeup detection unit 1200 generates and receives a wakeup signal. In addition, the controller 1300 performs a role of processing a data unit included in the first communication packet and deriving an ACK frame based on the wakeup preamble detection value derived from the wakeup detection unit 1200.

More specifically, the control unit 1300 wakes up from the sleep state by the wakeup signal generated by the wakeup detection unit 1200, and then processes the data part included in the first communication packet received by the RF unit 1100. Then, the wakeup detection unit 1200 loads a pre-stored wakeup preamble detection value to derive an ACK frame. Preferably, the control unit 1300 performs a medium access control included in the control unit 1300 by processing de-spreading and channel decoding on the data unit. It transmits to a performing unit, and the MAC unit performs a data unit processing step of processing the decoded data unit, and generates an ACK frame based on the decoded data unit and the loaded wakeup preamble detection value. Meanwhile, the generated ACK frame may be subjected to channel encoding and spreading again by the control unit 1300 and transmitted to a communication terminal that has transmitted the first communication packet.

Meanwhile, the control unit 1300 may be configured in software because it does not require relatively high performance compared to the wakeup detection unit 1200, and preferably, channel coding and diffusion are performed by the control unit 1300. It may be configured in software only for functions that process (spreading) or de-spreading.

As described above, according to an embodiment of the present invention, by distributing the configuration of the communication terminal 1000 into hardware and software, the communication terminal 1000 can be manufactured at a lower cost than the manufacturing cost of the communication terminal 1000 composed of only hardware. It can exert an effect.

According to an embodiment of the present invention, the transmission power level of the transmission data to be transmitted to the corresponding other communication terminal is adjusted later based on the wakeup preamble detection value included in the ACK frame received from the other communication terminal. While considering, transmission data is transmitted at a minimum transmission power level, and the effect of reducing power consumption of a communication terminal can be exhibited.

According to an embodiment of the present invention, when an ACK frame for transmission data transmitted to another communication terminal is not received from a corresponding other communication terminal within a preset time, the transmission power level of the transmitted transmission data is gradually increased and retransmitted. Therefore, the effect of reducing the power consumption of the communication terminal can be exhibited.

According to an embodiment of the present invention, the wakeup preamble detection value corresponds to a value obtained by digitizing the correlation with the preamble pattern data previously stored in the communication terminal receiving the data, and the wakeup preamble detection value is a threshold value. If it is not exceeded, since the process for deriving the ACK frame by maintaining the sleep state is not performed, it is possible to reduce the power consumption of the corresponding communication terminal and at the same time reduce the load of the corresponding network.

According to an embodiment of the present invention, a wakeup preamble detection value transmitted immediately before is included in an ACK frame, and the wakeup preamble detection value is transmitted later by utilizing a received signal strength indicator (RSSI). Since the transmission data is transmitted at the minimum transmission power level that can be communicated by adjusting the transmission power level of the transmission data to be transmitted, the effect of reducing power consumption of the communication terminal can be exhibited.

According to an embodiment of the present invention, since the configuration for performing the ACK frame derivation step is configured in software, and is performed when the wakeup preamble detection value exceeds the threshold value, power consumption of the communication terminal can be reduced. , It can exert the effect that can reduce the manufacturing cost of communication terminal.

According to an embodiment of the present invention, since the MAC header included in the data part of the first communication packet is preferentially decoded, and it is determined whether to decode the entire data part according to the reception address information included in the decoded MAC header, the communication terminal It can exert the effect of reducing the computational amount of.

According to an embodiment of the present invention, when the reception address information of the decoded MAC header is not included in the routing table, the reception of the data unit is stopped and the data is switched back to the sleep state, so that the power of the communication terminal can be efficiently used. Can be exerted.

According to an embodiment of the present invention, the configuration for performing the wakeup detection step is configured in hardware, and the configuration for performing the data processing step is configured in software, so that computing power for processing communication packets in the communication terminal is provided. It can effectively provide and at the same time exhibit the effect of minimizing power consumption.

Although the embodiments have been described by the limited embodiments and drawings as described above, various modifications and variations can be made from the above description to those of ordinary skill in the art. For example, the described techniques are performed in a different order from the described method, and/or components such as systems, structures, devices, circuits, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved. Therefore, other implementations, other embodiments, and those equivalent to the claims also fall within the scope of the claims to be described later.

Claims (6)

As a communication packet processing method in a communication terminal of a multi-hop-based low-power wide area communication network,
A wakeup preamble receiving step of receiving the wakeup preamble of a first communication packet including a wakeup preamble and a data unit from another communication terminal;
A wakeup detection step of deriving a wakeup preamble detection value based on the wakeup preamble and preamble pattern data stored in the communication terminal, and generating a wakeup signal according to the wakeup preamble detection value;
A data unit receiving step of waking up from a sleep state according to the wakeup signal and receiving a data unit of the first communication packet; And
Data unit processing for decoding the MAC header included in the data unit received in the data unit receiving step, and processing the data unit based on reception address information included in the decoded MAC header and a routing table stored in the communication terminal Includes;
The data part processing step,
A data portion decoding step of decoding the entire data portion and providing the decoded data portion to an upper layer when the reception address information of the decoded MAC header corresponds to a communication terminal receiving the data portion;
When the reception address information of the decoded MAC header does not correspond to the communication terminal receiving the data unit and the reception address information is included in the routing table, a second data unit including the data unit received in the data unit receiving step A second communication packet transmission step of transmitting the communication packet to another communication terminal corresponding to the reception address information and the routing table; And
In the case where the reception address information of the decoded MAC header is not included in the routing table, the reception of the data unit is stopped and a sleep state switching step of switching from a wake-up state to a sleep state; a communication packet processing method comprising: .
The method according to claim 1,
The wakeup detection step,
The wakeup preamble is detected by calculating the sum of the calculated values derived by performing XNOR operations on each of the at least one detailed data included in the preamble pattern data and the corresponding detailed data included in the wakeup preamble of the first communication packet. Communication packet processing method derived by value.
As a communication packet processing method in a communication terminal of a multi-hop-based low-power wide area communication network,
A wakeup preamble receiving step of receiving the wakeup preamble of a first communication packet including a wakeup preamble and a data unit from another communication terminal;
A wakeup detection step of deriving a wakeup preamble detection value based on the wakeup preamble and preamble pattern data stored in the communication terminal, and generating a wakeup signal according to the wakeup preamble detection value;
A data unit receiving step of waking up from a sleep state according to the wakeup signal and receiving a data unit of the first communication packet; And
Data unit processing for decoding the MAC header included in the data unit received in the data unit receiving step, and processing the data unit based on reception address information included in the decoded MAC header and a routing table stored in the communication terminal Includes;
The data part processing step,
Including; when the time to live information further included in the decoded MAC header is less than or equal to a preset value, stopping reception of the data unit and switching from a wake-up state to a sleep state; including, Communication packet processing method.
The method according to claim 1,
The configuration for performing the wakeup detection step is configured in hardware to perform only the wakeup detection step,
The configuration for performing the data unit processing step is configured by software.
A communication terminal that processes communication packets by being included in a multi-hop-based low-power wide area communication network.
A wakeup preamble receiving step of receiving the wakeup preamble of a first communication packet including a wakeup preamble and a data unit from another communication terminal;
A wakeup detection step of deriving a wakeup preamble detection value based on the wakeup preamble and preamble pattern data stored in the communication terminal, and generating a wakeup signal according to the wakeup preamble detection value;
A data unit receiving step of waking up from a sleep state according to the wakeup signal and receiving a data unit of the first communication packet; And
Data unit processing for decoding the MAC header included in the data unit received in the data unit receiving step, and processing the data unit based on reception address information included in the decoded MAC header and a routing table stored in the communication terminal To perform the steps;
The data part processing step,
A data portion decoding step of decoding the entire data portion and providing the decoded data portion to an upper layer when the reception address information of the decoded MAC header corresponds to a communication terminal receiving the data portion;
When the reception address information of the decoded MAC header does not correspond to the communication terminal receiving the data unit and the reception address information is included in the routing table, a second data unit including the data unit received in the data unit receiving step A second communication packet transmission step of transmitting the communication packet to another communication terminal corresponding to the reception address information and the routing table; And
When the reception address information of the decoded MAC header is not included in the routing table, a sleep state conversion step of stopping reception of the data unit and switching from a wake-up state to a sleep state; processing a communication packet, including Communication terminal.
A communication terminal that processes communication packets by being included in a multi-hop-based low-power wide area communication network.
A wakeup preamble receiving step of receiving the wakeup preamble of a first communication packet including a wakeup preamble and a data unit from another communication terminal;
A wakeup detection step of deriving a wakeup preamble detection value based on the wakeup preamble and preamble pattern data stored in the communication terminal, and generating a wakeup signal according to the wakeup preamble detection value;
A data unit receiving step of waking up from a sleep state according to the wakeup signal and receiving a data unit of the first communication packet; And
Data unit processing for decoding the MAC header included in the data unit received in the data unit receiving step, and processing the data unit based on reception address information included in the decoded MAC header and a routing table stored in the communication terminal To perform the steps;
The data part processing step,
Including; when the time to live information further included in the decoded MAC header is less than or equal to a preset value, stopping reception of the data unit and switching from a wake-up state to a sleep state; including, A communication terminal that processes communication packets.

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