KR102388018B1 - Apparatus for scheduling power transmission and data communication and method therefor - Google Patents

Abstract

The apparatus for scheduling power transmission and data communication of the present invention includes a plurality of slave devices for transmitting a joint request message for requesting participation in a network, and a plurality of array antennas, and receives the join request message Then, it includes a master device that dynamically schedules channel resource allocation for power transmission and data communication on a superframe according to the number of slave devices that have transmitted the participation request message.

Description

Apparatus for scheduling power transmission and data communication and method therefor

The present invention relates to a scheduling technique, and more particularly, to a method and apparatus for scheduling wireless power and data transmission.

As the Internet of Things (IoT) is widespread and massively expanded into various fields for monitoring and controlling the surrounding environment, numerous sensor devices are being used everywhere, extending the lifespan other than constant power and batteries in terms of power supply. The need for a method has increased. Recently, wireless charging technology has been grafted as a method of extending the lifespan other than power and battery. Recently, a charging technology using RF (Radio Frequency) for wireless charging of a mobile device or a remote IoT device has been studied. However, the method of transmitting power using RF has a disadvantage in that the transmission efficiency is very weak. Recently, in order to overcome the transmission efficiency of RF wireless power transmission, a technique of beamforming power to a specific location has been introduced.

The core of the technology of beamforming power to a specific location through RF wireless power transmission is to precisely form and transmit power to a desired location. Therefore, in order to beamform power to a specific location of the receiving end, the transmitting end that transmits power needs to know the location of the receiving end. The receiving end sends a specific data signal to inform the power transmitting end of its location so that the transmitting end recognizes the location. This method is known as retro-reflective power beamforming.

In the past, the beamforming method was proposed as a structure for transmitting power to a single receiving device, or the transmitting end transmits power without a scheduling technique, and when the optimal power is received, the receiving end informs the transmitting end of the information. . This method is inefficient and wastes channel resources when a large number of receiving terminals exist.

Publication of Korean Patent Application Laid-Open No. 10-2011-0125755 on November 22, 2011 (Title: Apparatus and method for transmitting power and data using a mobile device)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a scheduling method and an apparatus therefor, for a slave device receiving a plurality of powers to receive power from a master device transmitting one power and transmit/receive data at the same time.

It is also an object of the present invention to provide a scheduling method and an apparatus therefor, capable of supplying power to a slave device and simultaneously transmitting and receiving data with low power by applying beamforming, which is a wireless power transmission technology, to wireless network communication.

An apparatus for scheduling power transmission and data communication according to a preferred embodiment of the present invention for achieving the above object includes a plurality of slave devices that transmit a Join Request message for requesting participation in a network; A master device comprising a plurality of array antennas, and upon receiving the participation request message, dynamically scheduling channel resource allocation for power transmission and data communication on a superframe according to the number of slave devices that have transmitted the participation request message include

The superframe includes a master beacon (MB), a carrier sense multiple access (CSMA), and a channel time allocation (CTA) period.

The channel time allocation section includes a Power Time Allocation (PTA) section for power transmission of variable length and a Data Time Allocation (DTA) section for data communication.

Any one of the plurality of slave devices transmits a power beacon (PB) in a slot allocated to the one slave device in the power time allocation section, and the master device receives the power beacon , identifying the position of the one slave device based on the received phase information of the power beacon, and transmitting power by beamforming to the identified position through the plurality of array antennas.

Any one of the plurality of slave devices transmits a data beacon (DB) in a slot allocated to the one slave device in the data time allocation section, and the master device receives the data beacon , identify the position of the one slave device based on the received phase information of the data beacon, and receive data from the slave device by beamforming to the identified position through the plurality of array antennas, or to the slave device It is characterized by transmitting data.

The power time allocation section includes a plurality of power slots (P-Slot: Power Slot) for the master device to transmit power to the slave device, and the power slot includes a power beacon, power transmission (P_Tx: Power Tx) and a power reception (P_Rx: Power Rx) interval, wherein the length of the power time allocation interval includes a time of the power transmission and power reception interval that is changed according to a request of the slave device, and a power slot allocated to the slave device. It is characterized in that it varies according to the number of

The data time allocation section includes a plurality of data slots (D-Slot: Data Slot) for data communication between the master device and the slave device, and the data slots include a data beacon, data transmission (D_Tx: Data Tx) and a data reception (D_Rx: Data_Rx) interval, wherein the length of the data time allocation interval is changed according to the request of the slave device according to the time of the data transmission and data reception interval and the number of data slots allocated to the slave device It is characterized in that it is variable.

Any one of the plurality of slave devices and the master device transmit/receive data to each other without the data beacon in a data slot allocated to the one slave device in the data time allocation section.

The method for scheduling power transmission and data communication according to a preferred embodiment of the present invention for achieving the above object is a master device in a master beacon (MB: Master Beacon) section, carrier sensing multiple access (CSMA: Carrier Sense) Transmitting a master beacon in a master beacon section of a superframe including a Mutliple Access section and a Channel Time Allocation (CTA) section, and when a plurality of slave devices receive the master beacon, join Request) transmitting a message, and when the master device receives the participation request message, a Power Time Allocation (PTA) period and data time allocation (PTA) according to the number of slave devices that have transmitted the participation request message ( and dynamically scheduling channel resource allocation for power transmission and data communication on the channel time allocation interval including a Data Time Allocation (DTA) interval.

After the step of dynamically scheduling the channel resource allocation, any one of the plurality of slave devices receives power in a power slot (P-Slot) allocated to the one slave device in the power time allocation period. Transmitting a beacon (PB: Power Beacon), and when the master device receives the power beacon, identifying the location of the one slave device based on the received phase information of the power beacon, the master device The method further includes transmitting power by beamforming to the identified position through a plurality of array antennas.

After the step of dynamically scheduling the channel resource allocation, any one of the plurality of slave devices performs data in a data slot (D-Slot) allocated to the one slave device in the data time allocation interval. Transmitting a beacon (DB: Data Beacon); when the master device receives the data beacon, identifying the location of the one slave device based on the received phase information of the data beacon; The method further includes receiving data from the slave device or transmitting data to the slave device by beamforming to the identified position through a plurality of array antennas.

After the step of dynamically scheduling the channel resource allocation, any one of the plurality of slave devices and the master device mutually interact without a data beacon in the data slot allocated to the one slave device in the data time allocation period. The method further includes transmitting and receiving data.

The power time allocation section includes a plurality of power slots for the master device to transmit power to the slave device, and the power slots include a power beacon, power transmission (P_Tx: Power Tx), and power reception (P_Rx: Power Rx). ) section, wherein the length of the power time allocation section varies according to the time of the power transmission and power reception section that is changed according to the request of the slave device, and the number of power slots allocated to the slave device do it with

The data time allocation section includes a plurality of data slots for data communication between the master device and the slave device, and the data slots include data beacon, data transmission (D_Tx: Data Tx), and data reception (D_Rx: Data_Rx) sections. wherein the length of the data time allocation interval is variable according to the data transmission and data reception interval times that are changed according to the request of the slave device and the number of data slots allocated to the slave device.

According to the present invention, it is possible to efficiently supply power to a slave device that receives power using a single channel in a wireless environment. In addition, the master device that transmits power calculates the phase changed through a beacon received from the slave device and grasps the location of the slave device, thereby intensively transmitting power and data to the location of the slave device at the same time. . And the present invention proposes efficient scheduling for transmitting data and power in the same channel. Moreover, according to the present invention, even when a plurality of slave devices exist, power and data can be exchanged without mutual interference by scheduling.

1 is a diagram for explaining the configuration of a power transmission and data communication system according to an embodiment of the present invention.
2 is a diagram for explaining the structure of a superframe according to an embodiment of the present invention.
3 is a diagram for explaining the operation of an apparatus for scheduling power transmission and data communication in a master beacon (MB) section and a carrier sensing multiple access (CSMA) section according to an embodiment of the present invention.
4 is a view for explaining the operation of the master device and the slave device in the power time allocation (PTA) section according to an embodiment of the present invention.
5 is a diagram for explaining the operation of a master device and a slave device in a data time allocation (DTA) section according to an embodiment of the present invention.
6 is a timing diagram illustrating one-to-many communication between a master device and a plurality of slave devices according to an embodiment of the present invention.
7 is a timing diagram illustrating one-to-many communication between a master device and a plurality of slave devices according to another embodiment of the present invention.
8 is a flowchart illustrating a method for scheduling power transmission and data communication of a master device according to an embodiment of the present invention.
9 is a flowchart illustrating a method for scheduling power transmission and data communication of a slave device according to an embodiment of the present invention.

Prior to the detailed description of the present invention, the terms or words used in the present specification and claims described below should not be construed as being limited to their ordinary or dictionary meanings, and the inventors should develop their own inventions in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be appropriately defined as a concept of a term for explanation. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all the technical spirit of the present invention, so various equivalents that can be substituted for them at the time of the present application It should be understood that there may be water and variations.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, it should be noted that in the accompanying drawings, the same components are denoted by the same reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings, and the size of each component does not fully reflect the actual size.

The present invention relates to optimal resource allocation scheduling for power transmission and data communication from a single channel to a mobile phone, a wearable device, a sensor device, and the like. The present invention proposes a scheduling mechanism method for a plurality of receiving end devices that receive power on the same channel to transmit and receive data while receiving power from one power transmitting end. Through this, the present invention can supply power to the receiving end device and simultaneously transmit information (data) of a plurality of receiving end devices. In particular, according to the present invention, since one power transmitter simultaneously transmits power and data to the power receiver on the same channel, it is possible to perform efficient low-power wireless communication in a network composed of a plurality of receivers and ultimately extend the network lifespan. Then, a system for power transmission and data communication according to an embodiment of the present invention will be described. 1 is a diagram for explaining the configuration of a power transmission and data communication system according to an embodiment of the present invention. 1, the system according to the embodiment of the present invention includes one master device 100 for transmitting power in a one-to-many communication structure and a plurality of slave devices 200 for receiving power. include The master device 100 includes a plurality of array antennas for beamforming, and may be a device to which power is always connected. The slave device 200 may be exemplified by a mobile phone, a wearable device, a sensor, or the like.

According to an embodiment of the present invention, the master device 100 supplies power to the slave device 200 through beamforming and at the same time performs low-power data communication between the master device 100 and the slave device 200. Scheduling is performed on a superframe (SF: Superfame) according to Then, a superframe (SF) according to an embodiment of the present invention will be described. 2 is a diagram for explaining the structure of a superframe according to an embodiment of the present invention.

Referring to FIG. 2 , a superframe (SF: Superfame) according to an embodiment of the present invention includes a master beacon (MB) section, a carrier sense multiple access (CSMA) section, and a channel time assignment (CTA). : Channel Time Allocation) section.

The master beacon (MB) section is a section in which the master device 100 transmits a master beacon (MB) to the plurality of slave devices 200 by broadcast.

The carrier sensing multiple access (CSMA) section is a section in which the slave device 200 that has received the master beacon (MB) in the master beacon (MB) section transmits a Join Request message to the master device 100 . Accordingly, the master device 100 may receive a Join Request message from the plurality of slave devices 200 in the carrier sensing multiple access (CSMA) section. Then, the master device 100 dynamically allocates channel resources for power transmission and data communication in the channel time assignment (CTA) section of the superframe (SF) according to the number of slave devices 200 that have transmitted the participation request message. can be scheduled.

The channel time allocation (CTA) period is a period for power transmission and data communication. The master device 100 allocates channel resources for power transmission and data communication to each of the slave devices 200 that have transmitted the participation request message. The channel time allocation (CTA) period includes a power time allocation (PTA) period and a data time allocation (DTA) period.

Here, the power time allocation (PTA) section is a section for the master device 100 to transmit power to the slave device 200 . This power time allocation (PTA) period includes a plurality of power slots (P-Slot: Power-Slot) for power transmission. In addition, the data time allocation (DTA) section is a section for data communication between the master device 100 and the slave devices 200 with each other. The data time allocation (DTA) period includes a plurality of data slots (D-Slots) for data transmission.

As described above, the present invention is structurally different from the conventional superframe in that a power slot (P-Slot) for power transmission is separately allocated. In addition, the present invention transmits data and a power beacon (PB) for informing the location of the slave device 200 that receives power in addition to the master beacon (MB), which is a beacon for network synchronization on the superframe (SF). and a data beacon (DB: Data Beacon) for a reception request is additionally used.

The master beacon (MB) section is a section in which the master beacon (MB) is transmitted. The master beacon MB is a beacon that the master device 100 transmits to the plurality of slave devices 200 in a broadcast manner. The master beacon MB serves to synchronize the plurality of slave devices 200 located within the same network as the master device 100 , that is, located within the transmission range of the master device 100 . The master beacon (MB) is information about the slots (P-Slot, D-Slot) allocated to the power time allocation (PTA) period and the data time allocation (DTA) period of the channel time allocation (CTA) period. have Specifically, the slot information includes the number of slots, a time per slot, a slot unit time (SUT), and a slave ID per slot. The number of slots included in the slot information and the time per slot may be variably changed according to the request of the slave device 200 .

After the master beacon (MB) section in the time domain, there is a Carrier Sense Multiple Access (CSMA) section. The carrier sensing multiple access (CSMA) section is a section for forming a network between the master device 100 and the plurality of slave devices 200 . In the carrier sensing multiple access (CSMA) section, the plurality of slave devices 200 transmits a Join Request message indicating the intention to participate in the network to the master device 100 . The master device 100 may check the slave device 200 that has transmitted the Join Request message by receiving the Join Request message. Then, in the master device 100, the slave device 200 that has transmitted the Join Request message according to the number of the slave devices 200 that has transmitted the Join Request message transmits the power time allocation (PTA) period. A slot, that is, a power slot (P-Slot: Power-Slot) and a data slot (D-Slot), is allocated through scheduling so that power and data can be transmitted/received in each of the DTA and DTA periods. Thereafter, the master device 100 transmits a response to the Joint Request with the allocated slot information to the slave device 200 so that the slave device 200 can participate in the network. In the carrier sensing multiple access (CSMA) section, the above-described process is repeated to complete network formation.

After the Carrier Sense Multiple Access (CSMA) period in the time domain, there is a Channel Time Allocation (CTA) period. The channel time allocation (CTA) section includes a power time assignment (PTA) section for power transmission and a data time assignment (DTA) section for data transmission and reception. Depending on the purpose, the order of the power time allocation (PTA) period and the data time allocation (DTA) period may be changed. When power transmission is to be given priority, the power time assignment (PTA) section can be placed in front of the channel time assignment (CTA) section. there is. In addition, the time of the power time assignment (PTA) section and the data time assignment (DTA) section is determined in each superframe ( SF) may vary.

The power time allocation (PTA) section may consist of a plurality of power slots (P-Slot) for the master device 100 to transmit power to a plurality of slave devices 200, and the power slot (P-Slot) is It may be composed of a power beacon (PB) section, a power transmission (P_Tx: Power Tx) section, and a power reception (P_Rx: Power Rx) section. In the power beacon (PB) section, the power beacon (PB) is transmitted, and the slave device 200 transmits the power beacon (PB) to the master device 100 so that the master device 100 can recognize the position where the power is to be formed. send. The power beacon PB includes phase information for recognizing the location of the corresponding slave device 200 . The master device 100 receives the information of the power beacon PB and extracts the phase of the signal incident from each transmit antenna, or performs a position recognition algorithm (eg, MUSIC algorithm, etc.) to perform beamforming of power. The position of the position of (200) can be grasped. Since the time of the power transmission (P_Tx: Power Tx) section and the power receiving (P_Rx: Power Rx) section may vary according to the request of the slave device 200 , the time of the power slot (P-Slot) may be varied.

The data time allocation (DTA) section may consist of a plurality of data slots (D-Slot) for data transmission and reception between the master device 100 and the slave device 200, and the data slot D-Slot is a data It may consist of a beacon (DB) section, a data transmission (D_Tx: Data Tx) section, or a data reception (D_Rx: Data_Rx) section. A data beacon (DB) is transmitted in the data beacon (DB) section, and the data beacon (DB) is a beacon for the master device 100 and the slave device 200 to exchange data, and from the slave device 200 to the master device is sent to (100). Like the power beacon PB, the data beacon DB also includes information for identifying the location of the slave device 200, for example, phase information. Like power transmission, the master device 100 may transmit data through beamforming by calculating the position of the slave using the phase information contained in the data beacon DB. As the master beamforms, a signal-to-noise ratio (SNR) increases, and data can be transmitted to the slave device 200 using less power than a general data transmission method. Accordingly, the slave device 200 may receive data with less power. Since the time of the data transmission (D_Tx: Data Tx) section and the data receiving (D_Rx: Data_Rx) section may vary according to the request of the slave device 200 , the time of the data slot (D-Slot) is not fixed. The master device 100 or the slave device 200 performs both data transmission (D_Tx) and data reception (D_Rx) in the data slot (D-Slot), or performs only data transmission (D_Tx) or data reception (D_Rx). can When the slave device 200 has a lot of data to be transmitted, the remaining time except for the data beacon DB in the data slot D-Slot allocated to the slave device 200 may be used only as the data transmission (D_Tx) period if necessary. . Correspondingly, the master device 100 may only perform data reception (D_Rx) for the remaining time in the data slot (D-Slot) except for the data beacon (DB) section. The superframe SF is repeated over time, and the time of the power time allocation (PTA) period and the data time allocation (DTA) period may be dynamically changed according to network conditions.

Next, operations of the master device 100 and the slave device 200 in the master beacon (MB) section and the carrier sensing multiple access (CSMA) section will be described. 3 is a diagram for explaining the operation of an apparatus for scheduling power transmission and data communication in a master beacon (MB) section and a carrier sensing multiple access (CSMA) section according to an embodiment of the present invention.

Referring to FIG. 3 , the master device 100 transmits the master beacon MB for synchronization to a plurality of adjacent slave devices 200 in the master beacon MB section in a broadcast manner. The slave device 200 synchronizes with the network through the received master beacon (MB), and transmits a Join Request message to the master to participate in the network in the carrier sensing multiple access (CSMA) section. The master checks the number of slaves participating in the network through the received Join Request message, and assigns slots (P-Slot, D-Slot) for each slave device 200 to the channel time allocation (CTA) section through scheduling. allocate Accordingly, power transmission and data transmission/reception are performed through slots (P-Slot, D-Slot) allocated within the channel time allocation (CTA) period.

Next, operations of the master device 100 and the slave device 200 in the channel time allocation (CTA) section will be described. At this time, the operation of the master device 100 and the slave device 200 will be described by dividing the power time assignment (PTA) section and the data time assignment (DTA) section of the channel time assignment (CTA) section. 4 is a view for explaining the operation of the master device 100 and the slave device 200 in the power time allocation (PTA) section according to an embodiment of the present invention. 5 is a diagram for explaining the operations of the master device 100 and the slave device 200 in the data time allocation (DTA) section according to an embodiment of the present invention.

4 and 5 show beacon, power, and data transmission in a power time assignment (PTA) section and a data time assignment (DTA) section in a channel time assignment (CTA) section of a superframe (SF), respectively. In the embodiment of the present invention, a total of three beacons are used: a master beacon (MB), a power beacon (PB), and a data beacon (DB). The power beacon PB is used in the power time allocation (PTA) section of FIG. 4 , and the data beacon DB is used in the data time assignment (DTA) section of FIG. 5 .

4, in the power time allocation (PTA) period, each of the plurality of slave devices 200 transmits a power beacon PB to the master device 100 in order to request power in the allocated power slot (P-Slot). ) is sent to The master device 100 uses the phase information included in the received power beacon PB to determine the location of the slave device 200, and transmits power intensively by beamforming to the corresponding location through a plurality of array antennas. . At this time, the slave device 200 receiving power at the beamforming position and the adjacent slave device 200 operate in the reception mode because slots are not allocated. Accordingly, the corresponding slave device 200 may receive weak power through the reception mode.

Referring to FIG. 5 , in a data time allocation (DTA) period, the slave device 200 transmits a data beacon DB to the master device 100 for data transmission/reception. The master device 100 calculates the phase through the data beacon DB to determine the position of the slave device 200 , and performs beamforming toward the slave device 200 at the position identified through the plurality of array antennas. Then, the master device 100 and the slave device 200 perform data transmission (D_Tx) or data reception (D_Rx) during the data slot (D-Slot) allocated within the data time allocation (DTA) period.

Next, one-to-many communication between the master device 100 and the plurality of slave devices 200 according to an embodiment of the present invention will be described. 6 is a timing diagram illustrating one-to-many communication between the master device 100 and a plurality of slave devices 200 according to an embodiment of the present invention.

Referring to FIG. 6 , one master device 100 and a plurality of slave devices 200 may exist in the network, and slots (P-Slot, D-Slot) allocated to each slave device 200 according to network conditions. ) and the time per slot (P-Slot, D-Slot) may be variable.

The master device 100 transmits the master beacon (MB) omnidirectionally from the very beginning of the superframe (SF) for synchronization at the same time as the start. The plurality of slaves 200 receiving the master beacon (MB) transmit a Join Request message to the master device 100 in the carrier sensing multiple access (CSMA) section to participate in the network of the master device 100 . do. The master device 100 detects the number of slave devices 200 through the received Join Request message. Thereafter, the master device 100 assigns each slave device 200 participating in the network through scheduling to any slot (P-Slot, D-Slot) in the power time allocation (PTA) period and the data time allocation (DTA) period. Decide whether to allocate Then, the master device 100 transmits the slot information allocated according to the scheduling to the slave device 200 in response to the Join Request message. Accordingly, the master device 100 and the plurality of slave devices 200 form a network.

After the carrier sensing multiple access (CSMA) period, a channel time allocation (CTA) period may start, and a power time allocation (PTA) period of the channel time allocation (CTA) period may start. In the power time allocation (PTA) section, the slave device 200 participating in the network requests power transmission by transmitting a power beacon (PB) to the master device 100 in the power slot (P-Slot) to which it is allocated, It then receives power. The master device 100 may calculate the phase through the power beacon PB to determine the location of the slave device 200 that has requested power transmission, and transmit power to the corresponding location through beamforming. The number and time of power slots (P-Slots) allocated to each slave device 200 may be variably changed according to a request of the slave device 200 .

When the power time allocation (PTA) period for the plurality of slave devices 200 ends, the data time allocation (DTA) period may start. In the data time allocation (DTA) period, each slave device 200 transmits a data beacon DB for data transmission/reception to the master device 100 in a data slot (D-Slot) to which it is allocated. The master device 100 may perform beamforming through phase information of the data beacon DB. Accordingly, since data is transmitted by beamforming by the data beacon DB, the power consumption of the slave device 200 is reduced and communication can be performed with low power. In the data time allocation (DTA) period, the number and time of data slots (D-Slots) allocated to each slave device 200 may also be variably changed. When the data time allocation (DTA) period for the plurality of slave devices 200 ends, a new superframe SF starts, and the above-described process is repeated.

Next, one-to-many communication between the master device 100 and the plurality of slave devices 200 according to another embodiment of the present invention will be described. 7 is a timing diagram for explaining one-to-many communication between the master device 100 and the plurality of slave devices 200 according to another embodiment of the present invention. According to the embodiment of FIG. 6 described above, the data beacon DB is used in the data time allocation (DTA) period. According to another embodiment of the present invention of FIG. 7 , the data beacon DB may not be used in the data time allocation (DTA) period. That is, the embodiment of FIG. 7 shows one-to-many communication between the master device 100 and the plurality of slave devices 200 using a superframe (SF) structure that does not use a data beacon (DB) in the data time allocation (DTA) section. shows an example of

In the data time allocation (DTA) section of FIG. 6, beamforming is performed using a data beacon DB including phase information of the slave device 200, and data transmission and reception are performed efficiently for power reduction through beamforming. lost. On the other hand, in the data time allocation (DTA) section of FIG. 7 , data transmission and reception are performed between the master device 100 and the plurality of slave devices 200 without using the data beacon DB. According to the embodiment of FIG. 7 , it is possible to reduce power consumption used in terms of data beacon (DB) transmission and allocate longer data transmission (D_Tx) and data reception (D_Rx) times. However, since the data is not transmitted through beamforming, the SNR may be reduced, and thus the transmittable distance may be relatively reduced.

As described above, appropriate scheduling is required for the plurality of slave devices 200 to receive power from one master device 100 . The present invention provides an efficient scheduling method when a single or a plurality of slave devices 200 and one master device 100 transmit power and transmit/receive data through a single channel. Using the RF wireless power transmission technology according to the present invention, for example, the slave device 200 such as a mobile phone, a wearable device, a sensor, etc. is located within the RF reach even if it is not located in a place where power supply is limited. It is possible to receive power through beamforming. In addition, by calculating the continuously changing phase, wireless power transmission is possible not only to the slave device 200 having a fixed position but also to the flexible slave device 200 having a continuously changing position.

Next, a method of scheduling wireless power and data transmission of each of the master device 100 and the slave device 200 according to an embodiment of the present invention will be described. First, a method for scheduling power transmission and data communication of the master device 100 according to an embodiment of the present invention will be described. 8 is a flowchart illustrating a method for scheduling power transmission and data communication of the master device 100 according to an embodiment of the present invention.

Referring to FIG. 8 , the master device 100 performs synchronization by transmitting a master beacon (MB) in step S110, and waits for reception of a Join Request message in step S120. Accordingly, the master device 100 determines whether a join request message is received in step S130.

As a result of the determination, when a Join Request message is received, the master device 100 proceeds to step S140 to schedule power and data transmission. That is, the master device 100 receives the Join Request message and confirms the number of slave devices 200, and then the slave device 200 that has transmitted the Join Request message transmits the power time allocation (PTA). ) and a slot is allocated to transmit and receive power and data in each of the data time allocation (DTA) intervals.

Next, the master device 100 waits for power beacon (PB) reception in step S150. Accordingly, the master device 100 checks whether the power beacon (PB) is received in step S160. As a result of the check, when receiving the power beacon PB, the master device 100 calculates the position of the slave device 200 from the phase information included in the power beacon PB in step S170, and beams toward the calculated position. Forming to transmit power.

Next, the master device 100 waits for data beacon (DB) reception in step S180. Accordingly, the master device 100 confirms the data beacon (DB) reception in step S190. As a result of the check, when receiving the data beacon DB, the master device 100 calculates the position of the slave device 200 from the phase information included in the data beacon DB in step S200, and beams toward the calculated position. Forming to receive or transmit data.

The operations of the master device 100 in steps S110 to S200 as described above are repeated until the master device 100 is deactivated or terminated. Next, a method for scheduling power transmission and data communication of the slave device 200 according to an embodiment of the present invention will be described. 9 is a flowchart illustrating a method for scheduling power transmission and data communication of the slave device 200 according to an embodiment of the present invention.

Referring to FIG. 9 , the slave device 200 waits to receive the master beacon MB in step S210 . Accordingly, the slave device 200 checks whether the master beacon (MB) is received in step S220. As a result of the check, when receiving the master beacon (MB), the slave device 200 checks whether it is an allocated power slot (P-Slot) within a time domain power time allocation (PTA) interval in step S230. .

As a result of checking in step S230 , if it is an allocated power slot (P-Slot), the slave device 200 transmits a power beacon PB to the master device 100 in step S240. Then, the slave device 200 waits for power reception in step S250. Accordingly, the slave device 200 checks whether power is received in step S260.

As a result of the check in step S260, when power is received, the slave device 200 checks whether it is an allocated data slot (D-Slot) in the time domain data time allocation (DTA) interval in step S270 .

As a result of checking in step S270 , if the data slot D-Slot is assigned to itself, the slave device 200 transmits the data beacon DB to the master device 100 in step S280 . Then, the slave device 200 transmits or receives data during the data slot (D-Slot) allocated to it in step S290.

Meanwhile, the method according to the embodiment of the present invention described above may be implemented in the form of a program readable by various computer means and recorded in a computer readable recording medium. Here, the recording medium may include a program command, a data file, a data structure, etc. alone or in combination. The program instructions recorded on the recording medium may be specially designed and configured for the present invention, or may be known and available to those skilled in the art of computer software. For example, the recording medium includes magnetic media such as hard disks, floppy disks and magnetic tapes, optical recording media such as CD-ROMs and DVDs, and magneto-optical media such as floppy disks ( magneto-optical media) and hardware devices specially configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions may include not only machine language wires such as those generated by a compiler, but also high-level language wires that can be executed by a computer using an interpreter or the like. Such hardware devices may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

Although the present invention has been described above using several preferred embodiments, these examples are illustrative and not restrictive. As such, those of ordinary skill in the art to which the present invention pertains will understand that various changes and modifications can be made in accordance with the doctrine of equivalents without departing from the spirit of the present invention and the scope of rights set forth in the appended claims.

100: master device
200: slave device

Claims (14)

An apparatus for scheduling power transmission and data communication, comprising:
a plurality of slave devices for transmitting a Join Request message for requesting network participation; and
It includes a plurality of array antennas, and when the participation request message is received, a master beacon (MB: Master Beacon), a carrier sense multiple access (CSMA: Carrier Sense Mutliple Access) depending on the number of slave devices that have transmitted the participation request message and a master device for dynamically scheduling channel resource allocation for power transmission and data communication on a superframe including a channel time allocation (CTA) section;
The channel time allocation section is
Including a power time allocation (PTA: Power Time Allocation) section and a data time allocation (DTA: Data Time Allocation) section for data communication for which the length is variable,
When one of the plurality of slave devices transmits a power beacon (PB) in a slot allocated to the one slave device in the power time allocation period,
The master device identifies the location of the one slave device based on the phase information of the power beacon, and transmits power by beamforming to the identified location through the plurality of array antennas,
When any one of the plurality of slave devices transmits a data beacon (DB) in a slot allocated to the one slave device in the data time allocation period,
The master device identifies the location of the one slave device based on the phase information of the data beacon, and receives data from the slave device by beamforming to the identified location through the plurality of array antennas, or the slave device Transmitting data to the device, characterized in that
A device for scheduling power transmission and data communication. delete delete delete delete According to claim 1,
The power time allocation section is
The master device includes a plurality of power slots (P-Slot: Power Slot) for transmitting power to the slave device,
The power slot is
Includes power beacon, power transmission (P_Tx: Power Tx) and power reception (P_Rx: Power Rx) sections,
The length of the power time allocation section is
The time of the power transmission and power reception period, which is changed according to the request of the slave device, and the number of power slots allocated to the slave device.
A device for scheduling power transmission and data communication. According to claim 1,
The data time allocation section is
A plurality of data slots (D-Slot: Data Slot) for data communication between the master device and the slave device,
The data slot is
Includes data beacon, data transmission (D_Tx: Data Tx) and data reception (D_Rx: Data_Rx) sections,
The length of the data time allocation section is
The time of the data transmission and data reception period changed according to the request of the slave device and the number of data slots allocated to the slave device, characterized in that it is variable.
A device for scheduling power transmission and data communication. delete delete delete delete delete delete delete

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