KR20210131480A - Scheduling system and method for wireless transmission of power and data - Google Patents

Abstract

The present invention discloses a scheduling system and method for wireless transmission of power and data. The scheduling system of the present invention includes: a transmitting terminal which transmits power, and transmits and receives data; and a plurality of receiving terminals which allocate, when receiving a master beacon (MB) from the transmitting terminal, a slot within a contention free period (CFP) period by exchanging information with the transmitting terminal and another receiving terminal, and perform wireless power transmission and wireless data transmission/reception with the transmitting terminal and another receiving terminal according to the allocated slot by using a plurality of channels.

Description

Scheduling system and method for wireless transmission of power and data

The present invention relates to a scheduling technology for wireless transmission, and more particularly, to a scheduling system and method for wireless transmission of power and data for optimal resource allocation in order to simultaneously transmit power and data using a plurality of channels. it's about

As the Internet of Things (IoT) is widespread and massively expanded in various fields for monitoring and controlling the surrounding environment, numerous sensor devices are being used everywhere, and in terms of power supply, lifespans other than constant power and batteries The need for an extension method has increased.

Recently, wireless charging technology has been grafted as a method of extending the lifespan other than power and battery. In particular, among the methods of wireless charging technology, a charging technology using RF (Radio Frequency) for wireless charging of a mobile device or a remote IoT device is being studied. However, since the wireless charging technology using RF has very weak transmission efficiency, a method of applying a technology of beamforming power to a specific location is being studied in order to overcome this.

The key to beamforming power to a specific location for high-efficiency RF wireless power transmission is to precisely form and transmit power to a desired location. Therefore, in order to beamform power to a specific position 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. The conventional scheduling method for such beamforming has been used in a scheduling method in which time is divided into time slots and transmission/reception of power or data is used for each section.

The existing beamforming method is 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 transmits power in a way that informs the transmitting end of the information. . This method is inefficient and wastes channel resources when a large number of receiving terminals exist.

In addition, since the conventional scheduling method uses a single channel, only one receiving end can transmit/receive power or data during a single period. Such a scheduling method not only fails to consider the communication environment between devices at the receiving end, but also has a problem in that the efficiency of data transmission/reception and power transmission/reception is very low.

Patent Laid-Open Patent Publication No. 10-2009-0069765 (2009.07.01.)

It is an object of the present invention to provide a scheduling system and method for wirelessly transmitting power and data, which efficiently allocates resources to enable simultaneous wireless transmission of power and data.

Another object of the present invention is to provide a scheduling system and method for wirelessly transmitting power and data stably maintaining power transmission quality.

Another object of the present invention is to provide a scheduling system and method for wirelessly transmitting power and data for transmitting power by reflecting the energy level of a receiving end.

In order to achieve the above object, the scheduling system for wirelessly transmitting power and data according to the present invention transmits power and transmits data and receives a master beacon (MB) from the transmitting end and the transmitting end, the transmitting end and Allocating a slot within a contention free period (CFP) period by exchanging information with another receiving end, and performing wireless power transmission and wireless data transmission/reception with the transmitting end and the other receiving end according to the allocated slots using a plurality of channels It includes a plurality of receiving ends.

In addition, when communication is not made between the transmitter and the plurality of receivers for more than a preset time, the transmitter and the plurality of receivers are switched to a sleep mode.

A transmitting end according to the present invention transmits a MB (master beacon) to a transmitting end communication unit performing communication with a plurality of receiving ends and a plurality of receiving ends, and allocates a slot within a CFP (contention free period) period by exchanging information with each receiving end, , using a plurality of channels, and a transmitter control unit for controlling to perform wireless power transmission and wireless data transmission/reception with at least one of the plurality of receivers according to the assigned slot.

In addition, the transmitter control unit, when allocating the slot, characterized in that it further allocates a spare channel for the wireless power transmission.

In addition, when the quality of wireless power transmission is lower than a preset standard while the wireless power transmission is in progress, the transmitting end controller changes the frequency band to the spare channel.

In addition, the transmitting end control unit, when allocating the slot, characterized in that it determines the order of the wireless power transmission based on the energy level state of each receiving end.

In addition, when the wireless power transmission and the wireless data transmission/reception are simultaneously performed, the transmitter control unit performs communication using different channels.

In addition, the transmitting end control unit, when receiving a PB (position beacon) including phase information of the corresponding receiving end from any one of the plurality of receiving end to estimate the position of the receiving end, and beamforming power to the estimated position do it with

The receiving end according to the present invention includes a receiving end communication unit that communicates with a transmitting end and at least one other receiving end, and when receiving an MB (master beacon) from the transmitting end, exchanges information with the transmitting end and the other receiving end in a contention free period (CFP) period and a receiving end control unit for allocating a slot within the system and performing wireless power transmission and wireless data transmission/reception with the transmitting end and the other receiving end according to the allocated slots using a plurality of channels.

A multi-superframe according to the present invention is a beacon signal transmitted to a plurality of reception terminals located in the same network as a transmission terminal, and a master beacon (MB) including network synchronization information, after transmission of the MB, a slot for network formation is allocated. It includes a contention access period (CAP) period and a contention free period (CFP) period in which the transmitter and the plurality of receivers perform wireless power transmission and wireless data transmission and reception according to slots allocated in the CAP period using a plurality of channels. .

In addition, the CFP section includes a plurality of superframes, a first superframe of the plurality of superframes consists of 7 slots, and 15 slots after the first superframe are characterized.

A scheduling method for wireless transmission of power and data according to the present invention comprises the steps of: a transmitting end transmitting a master beacon (MB) to a plurality of receiving ends; the transmitting end exchanging information with each receiving end ) allocating a slot within the interval and performing, by the transmitter, wireless power transmission and wireless data transmission/reception with at least one of the plurality of receivers according to the allocated CFP slot using a plurality of channels.

A scheduling method for wireless transmission of power and data according to the present invention comprises the steps of: a receiving end receiving a master beacon (MB) from a transmitting end; period) allocating a slot within the interval and performing, by the receiving end, wireless power transmission and wireless data transmission and reception with the transmitting end and the other receiving end according to the allocated slots using a plurality of channels.

The scheduling system and method for wireless power and data transmission of the present invention can transmit/receive data to/from other receivers without interfering with power transmission/reception while transmitting/receiving power to one receiving end using a plurality of channels.

In addition, by setting a spare channel for power transmission/reception among a plurality of channels, when the quality of power transmission of the current power transmission/reception channel is deteriorated, the efficiency of power transmission may be increased by moving a frequency band to the spare channel.

In addition, by reflecting the energy level of the receiving end, power may be transmitted sequentially from the receiving end requiring power first.

It can also be converted to sleep-mode while the system is not in use to form a low-power network.

1 is a configuration diagram for explaining a scheduling system according to an embodiment of the present invention.
2 is a block diagram illustrating a transmitter according to an embodiment of the present invention.
3 is a block diagram illustrating a receiving end according to an embodiment of the present invention.
4 is a diagram for explaining the structure of a superframe according to an embodiment of the present invention.
5 is a diagram for explaining an MB according to an embodiment of the present invention.
6 is a diagram for explaining a CAP section according to an embodiment of the present invention.
7 is a diagram for explaining a CFP section according to an embodiment of the present invention.
8 is a diagram for explaining mesh topology communication between a transmitting end and a receiving end according to an embodiment of the present invention.
9 is a diagram for explaining the priority of power transmission according to an embodiment of the present invention.
10 is a diagram for explaining a scheduling method at a transmitting end according to an embodiment of the present invention.
11 is a diagram for explaining a scheduling method at a receiving end according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function is obvious to those skilled in the art or may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a configuration diagram for explaining a scheduling system according to an embodiment of the present invention.

Referring to FIG. 1 , the scheduling system 300 efficiently allocates resources to enable simultaneous wireless transmission of power and data. Through this, the scheduling system 300 stably maintains power transmission quality and transmits power by reflecting the energy level of the receiving end, thereby preferentially transmitting power from the receiving end requiring power. The scheduling system 300 includes a transmitter 100 and a receiver 200 .

The transmitting end 100 serves as a master, and wirelessly transmits power to the receiving end 200 using a plurality of channels and wirelessly transmits/receives data between the plurality of receiving terminals. In this case, the transmitter 100 may calculate the phase changing of the receiver receiving power to determine the location of the receiver, and transmit power to the determined location. In addition, when the quality of power transmission is deteriorated, the transmitter 100 may move a frequency band to increase power transmission efficiency. The transmitter 100 may be a base station.

The receiving end 200 serves as a slave, receives power or data from the transmitting end 100 , and transmits data to the transmitting end 100 . Here, the receiving end 200 includes a plurality, and the plurality of receiving terminals 200a, 200b, and 200c may perform communication with the transmitting end 100 according to a preset schedule. If the receiving end 200 corresponds to a sensor node, it may be various electronic products (eg, smartphones, desktops, laptops, tablet PCs, handheld PCs, IoT products, etc.).

Meanwhile, the scheduling system 300 establishes a communication network 350 between the transmitter 100 and the plurality of receivers 200a, 200b, and 200c to communicate with each other. Communication network 350 is Zigbee (zigbee), Bluetooth (bluetooth), Wireless LAN (IEEE 802.11b, IEEE 802.11a, IEEE 802.11g, IEEE 802.11n), Wireless Hart (ISO/IEC62591-1), ISA100.11a (ISO /IEC 62734), etc., may be a local area network.

Here, if the scheduling system 300 does not communicate between the transmitter 100 and the plurality of receivers 200a, 200b, and 200c for more than a preset time, the transmitter 100 and the plurality of receivers 200a, 200b, and 200c It can be switched to sleep mode to form a low-power network. The preset time may be 10 minutes to 30 minutes, but is not limited thereto.

2 is a block diagram illustrating a transmitter according to an embodiment of the present invention.

1 and 2 , the transmitting end 100 includes a transmitting end communication unit 110 and a transmitting end controlling unit 130 , and further includes a transmitting end storage unit 150 .

The transmitting end communication unit 110 communicates with the plurality of receiving terminals 200a, 200b, and 200c. The transmitting end communication unit 110 transmits power and transmits and receives data. Here, the transmitting end communication unit 110 may include a plurality of antennas for supporting a plurality of channels, and may individually include an antenna for transmitting power and an antenna for transmitting and receiving data.

The transmitter control unit 130 performs overall control for power transmission and data transmission/reception of the transmitter 100 . The transmitter controller 130 transmits a master beacon (MB) to the plurality of receivers 200a, 200b, and 200c through the transmitter communication unit 110 in a broadcast manner. Here, MB is a beacon signal for checking whether communication with the transmitter 100 is performed, and serves to provide network synchronization information to a plurality of receivers 200a, 200b, and 200c located in the same network as the transmitter 100. .

The transmitting end control unit 130 allocates and schedules slots within a contention free period (CFP) period by exchanging information with each receiving end that has transmitted an MB response signal. The transmitting end control unit 130 allocates a slot to match the state of the transmitting end 100 and each receiving end 200 , and allocates a slot for wireless power transmission and a slot for wireless data transmission and reception. At this time, the transmitting end control unit 130 further allocates a spare channel for wireless power transmission, so that when the quality of power transmission is lower than a preset standard, the frequency band is changed to a spare channel so that power transmission is performed. -adaptation) can be performed. Through this, the transmitting end control unit 130 may improve the efficiency of power transmission. In addition, the transmitter controller 130 may allocate slots by determining the order of power transmission based on the energy level state of each receiver 200 .

The transmitter control unit 130 controls to perform wireless power transmission and wireless data transmission/reception based on the scheduled result. That is, the transmitter controller 130 controls to perform wireless power transmission and wireless data transmission/reception with at least one of the plurality of receivers 200a, 200b, and 200c according to slots allocated using a plurality of channels. Here, when the wireless power transmission and wireless data transmission/reception are simultaneously performed, the transmitting end control unit 130 performs communication using different channels to prevent mutual interference. In particular, the transmitting end control unit 130 when receiving a PB (position beacon) including phase information of the corresponding receiving end from any one of the plurality of receiving end (200a, 200b, 200c) to estimate the position of the receiving end, the power to the estimated position can be transmitted by beamforming.

The transmitter storage unit 150 stores at least one of an algorithm, a program, and an application for the transmitter 100 to operate. The transmitting end storage unit 150 stores information received from the transmitting end communication unit 110 , and stores information and results calculated from the transmitting end control unit 130 . Transmitter storage unit 150 is a flash memory type (flash memory type), hard disk type (hard disk type), media card micro type (multimedia card micro type), card type memory (for example, SD or XD memory, etc.) , Random Access Memory (RAM), Static Random Access Memory (SRAM), Read-Only Memory, ROM, Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), Magnetic Memory , may include at least one storage medium of a magnetic disk and an optical disk.

3 is a block diagram illustrating a receiving end according to an embodiment of the present invention.

1 and 3 , the receiving end 200 includes a receiving end communication unit 210 and a receiving end control unit 230 , and further includes a receiving end storage unit 250 .

The receiving end communication unit 210 performs communication with the transmitting end 100 and at least one other receiving end. The receiving end communication unit 210 receives power and transmits and receives data. Here, the receiving end communication unit 210 may individually include an antenna for transmitting power and an antenna for transmitting and receiving data.

The receiving end controller 230 performs overall control for power reception and data transmission/reception of the receiving end 200 . When receiving the MB from the transmitting end 100 through the receiving end communication unit 210, the receiving end control unit 230 allocates and schedules a slot within the CFP section by exchanging information with the transmitting end and other receiving end. The receiving end controller 230 allocates slots to suit the states of the transmitting end 100 and the other receiving end, and allocates slots for wireless power transmission and slots for wireless data transmission and reception. At this time, the receiver control unit 230 performs channel adaptation by further allocating a spare channel for wireless power transmission, so that power transmission is performed by changing the frequency band to a spare channel when the quality of power transmission is lower than a preset standard. can do. In addition, the receiving end control unit 230 may determine the order of power transmission according to the order in which power is required by comparing the energy level states of the other receiving end.

The receiving end controller 230 controls to perform wireless power transmission and wireless data transmission/reception based on the scheduled result. Here, when the receiving end controller 230 requests power transmission from the transmitting end 100 , the PB including the phase information of the receiving end 200 may be transmitted to the transmitting end 100 to receive power from the transmitting end 100 .

The receiving end storage unit 250 stores at least one of an algorithm, a program, and an application for the receiving end 200 to operate. The receiving end storage unit 250 stores information received from the receiving end communication unit 210 , and stores information and results calculated from the receiving end control unit 130 . The receiving end storage unit 150 is a flash memory type, hard disk type, media card micro type, card type memory (eg, SD or XD memory, etc.), RAM, SRAM, ROM, EEPROM, PROM, magnetic memory, magnetic disk and at least one storage medium among optical disks.

4 is a diagram for explaining the structure of a superframe according to an embodiment of the present invention.

1 and 4 , the structure of a superframe includes an MB 410 , a CAP period 430 , and a CFP period 450 . Here, the superframe is a structure in which the CAP period 430 is reduced, and includes one CAP period 430 during one multi-superframe 470 .

The MB 410 is a beacon transmitted from the transmitter 100 to the receiver 200 , and serves to provide network synchronization information to the receiver 200 located in the same network as the transmitter 100 . MB 410 includes fixed channel information and network structure information. Here, the fixed channel information includes a common channel number to be used during the CAP period, and the network structure information includes a multi-superframe 470 during one beaconinterval 490. Number, slot ( It includes information on SO, MO, and BO, which are constant values that can calculate the time per slot).

The CAP section 430 is a section in which a network is formed after the MB 410 is transmitted and communicates using the same common channel as a carrier sense multiple access (CSMA) communication method. The receiving end 200 participates in the network by transmitting a join request message including the sub-SAB containing the slot information that it currently wants to the transmitting end 100 to the transmitting end 100 . The transmitting end 100 receives the participation request message from the receiving end 200, checks its own slot assignment information, and then puts slot information allocable to the corresponding receiving end in a response message and transmits it to the corresponding receiving end. Upon receiving the response message, the receiving end broadcasts information about the slot allocated to it in the vicinity, thereby preventing a slot allocation collision in advance. Here, in the case of the receiving end requesting power reception, the participation request message includes charging inform information, which is information for requesting power transmission, and transmits it. The transmitting end 100 receiving the participation request message allocates the corresponding receiving end to the superframe 455 in which power transmission is empty, and then includes information on allocating a slot for power transmission and a spare slot in the allocated superframe in a response message. transmitted to the corresponding receiver. At this time, the receiving end includes the amount of power required by the user in the response message related to charging, the number of slots according to the time to receive power, and the number of the CFP section 450 to receive power. In this way, the CAP section repeats the above-described process to complete network formation.

The CFP period 450 includes at least one superframe 455 , and preferably includes a plurality of superframes 455 . The CFP section 450 consists of 7 slots in the first superframe (superframe connected to the CAP section) in the multi-superframe 470 , and 15 slots after the first superframe. The CFP section 450 comprises a total of 16 channels, and by dividing each channel into 15 time slots, nodes to perform communication or power transmission/reception are allocated to each slot. Here, a channel for power transmission is determined during the CAP period, and by setting a spare channel, when the quality of power transmission/reception is lower than a preset standard, power transmission is supported by supporting channel-adaptation for transmitting and receiving power through the spare channel. can improve the efficiency of

On the other hand, the PB includes phase information indicating the location of the receiving end to receive power. That is, the transmitting end 100 receives the information of the PB, extracts the phase of the signal incident from each transmit antenna, or performs a position recognition algorithm (eg, MUSIC algorithm, etc.) to the position of the receiving end to beamform power. to estimate Here, P_TX and P_RX times for power transmission (ie, the number of allocated slots) are determined during the CAP period 430 .

5 is a diagram for explaining an MB according to an embodiment of the present invention, FIG. 6 is a diagram for explaining a CAP interval according to an embodiment of the present invention, and FIG. 7 is a CFP interval according to an embodiment of the present invention It is a drawing for explanation.

1 and 5 to 7 , the scheduling system 300 has a mesh-topology communication structure, and is composed of one transmitting end 100 and n (n is a natural number) receiving end 200. do. Here, each of the transmitting end 100 and the receiving end 200 performs the roles of a master and a slave. The transmitter 100 may be a device configured with a plurality of array antennas to perform beamforming, and to which power is always connected. The receiving end 200 may be various devices including a sensor, a smart phone, a wearable device, and the like.

The transmitting end 100 transmits the MB for synchronization to the neighboring receiving end 200 . The receiving end 200 synchronizes with the network through the received MB, and checks the structure of the common channel and superframe (FIG. 5).

Each of the receiving ends 200a, 200b, 200c, and 200d exchanges information for slot assignment of the CFP section using the CSMA communication method with other receiving ends including the transmitting end 100 . In this case, the slot allocation for power transmission may be requested only through the transmitter 100 . In addition, the transmitter 100 may request data transmission/reception with the receiver 200 by allocating a communication slot in a slot in which power is not transmitted ( FIG. 6 ).

Each of the receiving terminals 200a, 200b, 200c, and 200d may exchange data in an allocated slot, and the receiving end requesting power transmission transmits a PB to the transmitting end 100 . The transmitting end 100 estimates the position of the corresponding receiving end by using the phase information included in the received PB, and transmits power intensively by beamforming to the corresponding position. In this case, the receiving end adjacent to the receiving end that receives power intensively may receive weak power by setting a channel as a channel for power transmission in a slot section to which it is not allocated. Meanwhile, when the transmitter 100 does not transmit power, it may transmit/receive data through an allocated slot ( FIG. 7 ).

8 is a diagram for explaining mesh topology communication between a transmitting end and a receiving end according to an embodiment of the present invention.

Referring to FIG. 8 , the scheduling system 300 performs mesh topology communication between the transmitter 100 and the receivers 200a, 200b, and 200c. The scheduling system 300 includes a single transmitter 100 and a plurality of receivers 200a, 200b, and 200c, and can variably adjust the number of slots allocated to each receiver and the time per slot according to network conditions.

The transmitter 100 transmits the MB for synchronization in all directions at the same time as the start.

The plurality of receiving ends 200a, 200b, and 200c that have received the MB transmit a participation request message to the transmitting end or other receiving end using the CSMA communication method in the CAP section to participate in the network of the transmitting end 100 . Here, the transmitting end 100 and the receiving end 200a, 200b, and 200c included in the network repeatedly transmit and receive a participation request message and a response message while requesting and allowing slot allocation during the CFP period to finally form a network.

The receiving terminals 200a, 200b, and 200c participating in the network perform data transmission/reception or power reception in their assigned slots. In this case, the receiving terminals 200a and 200b requesting power transmit a PB to the transmitting end 100 to request power transmission, and receive the requested power. The transmitting end 100 may calculate a phase through the received PB to estimate the position of the receiving end that requested power transmission, and transmit power in the corresponding position. The number and time of slots allocated to each of the receivers 200a, 200b, and 200c may be variably changed according to the request of the receiver in the CAP period. The receiving end 200c that does not request power reception may perform data transmission/reception during an allocated slot period in a channel other than a channel for power transmission. Similarly, when the transmitter 100 also does not transmit power, data transmission/reception may be performed with the receiver through an allocated slot and a channel for data transmission.

In this way, the scheduling system 300 repeatedly performs the MB, CAP period, and CFP period. In detail, the scheduling system 300 starts a new multi-superframe when a preset number of CFP sections pass through the MB, and a new beacon interval starts when a preset number of multi-superframes pass, and this process passes over time repeat according to

9 is a diagram for explaining the priority of power transmission according to an embodiment of the present invention.

1 and 9 , the scheduling system 300 sets priorities and schedules power transmission.

The receiving terminals 200a, 200b, and 200c transmit a charge notification included when transmitting a participation request message for power transmission to the transmitting end 100 in the CAP section. Here, the charging notification means information for determining the CFP section in which power reception is desired according to the energy level of the receiving end. That is, the receivers 200a, 200b, and 200c may select the sequence number of the CFP section in the current network according to the degree of their energy level so that the power is transmitted from the receiver in which energy reception is urgent.

For example, when the receiving end 200a is the lowest energy level, the receiving end 200b is the intermediate energy level, and the receiving end 200c is the highest energy level, the transmitting end 100 is each receiving end 200a, 200b, 200c) After checking the charging notification that includes information on the energy level of , the power transmission may be scheduled in the order of the receiving end 200a, the receiving end 200b, and the receiving end 200c in the order of the lowest energy level. That is, the transmitter 100 may schedule power transmission to the receiver 200a between the first CFP period and the fourth CFP period 451, 452, 453, 454, and the fourth CFP period to the sixth CFP period ( It is possible to schedule power transmission to the receiving end 200b between 454, 455, and 456, and scheduling to transmit power to the receiving end 200c between the 6th CFP interval and the 8th CFP interval (456, 457, 458). can do.

10 is a diagram for explaining a scheduling method at a transmitting end according to an embodiment of the present invention.

1 and 10 , a transmitter 100 performs wireless power transmission and wireless data transmission/reception with a plurality of receivers 200 .

In step S101, the transmitter 100 transmits the MB. The transmitter 100 transmits the MB to the plurality of receivers 200 in a broadcast manner.

In step S103, the transmitter 100 determines whether a network participation request message has been received. The transmitting end 100 performs step S105 when a participation request message is received from at least one receiving end 200 , and re-performs step S103 if not received.

In step S105, the transmitting end 100 makes a network slot assignment request and permission with the receiving end that has made a network participation request. The transmitting end 100 allocates and schedules slots within the CFP section by exchanging information with the receiving end 200 . That is, the transmitting end 100 allocates a slot to suit the state of itself and each receiving end 200 , and allocates a slot for wireless power transmission and a slot for wireless data transmission and reception. In this case, the transmitter 100 further allocates a spare channel for wireless power transmission and, when the quality of power transmission is lower than a preset standard, changes the frequency band to a spare channel so that power transmission is performed (channel-adaptation). ) can be done.

In step S107, the transmitting end 100 determines whether the CAP period has ended. When the CAP period ends, the transmitter 100 performs step S109, and if not, it branches to step S103.

In step S109, the transmitting end 100 determines whether there is a receiving end requesting power reception in the CFP section. The transmitting end 100 performs step S111 if the receiving end requesting power reception exists, and branches to step S117 if it does not exist.

In step S111, the transmitter 100 determines whether the PB has been received. When the PB including the phase information of the receiving end is received, the transmitting end 100 performs step S113, and if not, performs step S111 again.

In step S113, the transmitter 100 transmits power. After estimating the position of the receiving end based on the phase information included in the PB, the transmitting end 100 beamforms and transmits power to the estimated position.

In step S115, the transmitting end 100 determines whether the CFP period and the multi-superframe have ended. The transmitting end 100 performs step S117 when the CFP section and the multi-super frame are finished, and branches to step S109 if not finished.

In step S117, the transmitter 100 transmits and receives data during the allocated slot period. The transmitting end 100 transmits/receives data to and from the corresponding receiving end in a slot section to which data transmission/reception is allocated.

In step S119, the transmitter 100 determines whether the CFP section and the multi-superframe are over. The transmitting end 100 performs step S121 when the CFP section and the multi-superframe are finished, and branches to step S109 if not finished.

In step S121, the transmitter 100 determines whether the beacon interval has ended. The transmitter 100 branches to step S101 when the beacon interval is over, and branches to step S103 if not.

11 is a diagram for explaining a scheduling method at a receiving end according to an embodiment of the present invention.

Referring to FIGS. 1 and 11 , the receiving end 200 performs wireless power reception and wireless data transmission/reception with one transmitting end 100 , and wireless data transmission/reception with at least one other receiving end.

In step S201, the receiving end 200 determines whether the MB has been received. The receiving end 200 performs step S203 if the MB is received from the transmitting end 100, and re-performs step S201 if not received.

In step S203, the receiving end 200 transmits a network participation request message. The receiving end 200 transmits a participation request message as a response message of the MB to the transmitting end 100 and at least one other receiving end.

In step S205, the receiving end 200 requests and permits network slot allocation with the transmitting end and at least one other receiving end. The receiving end 200 performs scheduling by allocating slots within the CFP section by exchanging information with the transmitting end and at least one other receiving end. That is, the receiving end 200 allocates a slot to match the state of itself, the transmitting end 100, and other receiving end, and allocates a slot for wireless power transmission and a slot for wireless data transmission and reception. At this time, when the quality of power reception is lower than a preset reference by allocating a spare channel for wireless power reception further, the receiving end 200 changes the frequency band to a spare channel to perform channel adaptation so that power reception is performed. have.

In step S207, the receiving end 200 determines whether the CAP period has ended. The receiving end 200 performs step S209 when the CAP section ends, and branches to step S203 if it does not end.

In step S209, the receiving end 200 determines whether power reception is requested during the CFP period. The receiving end 200 performs step S211 when power reception is requested, and branches to step S217 if not requested.

In step S211, the receiving end 200 transmits the PB. The receiving end 200 transmits the PB including its own phase information to the transmitting end 100 .

In step S213, the receiving end 200 receives power. The receiving end 200 receives beamformed power from the transmitting end 100 .

In step S215 , the receiving end 200 determines whether the CFP section and the multi-superframe have ended. The receiving end 200 performs step S217 when the CFP section and the multi-superframe are finished, and branches to step S209 if not finished.

In step S217, the receiving end 200 transmits and receives data during the allocated slot period. The receiving end 200 transmits/receives data to and from the transmitting end 100 and the corresponding other receiving end in a slot section to which data transmission/reception is allocated.

In step S219 , the receiving end 200 determines whether the CFP section and the multi-superframe have ended. The transmitter 200 performs step S221 when the CFP section and the multi-superframe are finished, and branches to step S209 if not finished.

In step S221 , the receiving end 200 determines whether the beacon interval has ended. The receiving end 200 branches to step S201 when the beacon interval ends, and branches to step S203 if not.

The present invention can also be implemented as computer-readable codes on a computer-readable recording medium. The computer-readable recording medium includes all types of recording devices in which data readable by a computer device is stored. Examples of computer-readable recording media include hard disks, ROMs, RAMs, CD-ROMs, hard disks, magnetic tapes, floppy disks, optical data storage devices, etc. It includes those implemented in the form of .

Although preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific preferred embodiments described above, and in the technical field to which the present invention belongs, without departing from the gist of the present invention as claimed in the claims Any person skilled in the art can make various modifications, of course, and such modifications are within the scope of the claims.

100: transmitter
110: transmitting end communication unit
130: transmitter control unit
150: transmitter storage unit
200: receiving end
210: receiving end communication unit
230: receiving end control unit
250: receiving end storage unit
300: scheduling system
350: communication network
410: MB
430: CAP section
450: CFP section
455: super frame
470: multi-superframe
490: beacon interval

Claims (13)

a transmitter for transmitting power and transmitting and receiving data; and
When a master beacon (MB) is received from the transmitting end, a slot within a contention free period (CFP) period is allocated by exchanging information with the transmitting end and another receiving end, and according to the allocated slots using a plurality of channels, the a plurality of receiving ends performing wireless power transmission and wireless data transmission/reception with a transmitting end and the other receiving end;
A scheduling system for wireless transmission of power and data comprising a. The method of claim 1,
The scheduling system for wireless transmission of power and data, characterized in that when communication is not made between the transmitter and the plurality of receivers for more than a preset time, the transmitter and the plurality of receivers are switched to a sleep mode. a transmitting end communication unit that communicates with a plurality of receiving ends; and
It transmits a master beacon (MB) to the plurality of receivers, allocates slots within a contention free period (CFP) period by exchanging information with each receiver, and uses a plurality of channels according to the assigned slots to the plurality of receivers. a transmitting end control unit for controlling to perform wireless power transmission and wireless data transmission/reception with at least one of;
A transmitter comprising a. 4. The method of claim 3,
The transmitting end control unit,
When allocating the slot, the transmitting end, characterized in that further allocating a reserved channel for the wireless power transmission. 5. The method of claim 4,
The transmitting end control unit,
The transmitting end, characterized in that the frequency band is changed to the spare channel when the quality of wireless power transmission is lower than a preset standard while the wireless power transmission is in progress. 4. The method of claim 3,
The transmitting end control unit,
When allocating the slot, the transmitting end, characterized in that for determining the order of the wireless power transmission based on the energy level state of each receiving end. 4. The method of claim 3,
The transmitting end control unit,
When the wireless power transmission and the wireless data transmission/reception are simultaneously performed, communication using different channels is performed. 4. The method of claim 3,
The transmitting end control unit,
When a position beacon (PB) including phase information of the corresponding receiver is received from any one of the plurality of receivers, a position of the corresponding receiver is estimated, and power is beamformed to the estimated position. a receiving end communication unit for communicating with the transmitting end and at least one other receiving end; and
Upon reception of a master beacon (MB) from the transmitter, a slot within a contention free period (CFP) period is allocated by exchanging information between the transmitter and the other receiver, and the transmitter and the transmitter according to the allocated slots using a plurality of channels a receiving end control unit for performing wireless power transmission and wireless data transmission/reception with the other receiving end;
A receiver comprising a. MB (master beacon) that is a beacon signal transmitted to a plurality of receivers located in the same network as the transmitter and includes network synchronization information;
After transmission of the MB, a CAP (contention access period) period for allocating a slot for network formation; and
a contention free period (CFP) period in which the transmitter and the plurality of receivers perform wireless power transmission and wireless data transmission/reception according to slots allocated in the CAP section using a plurality of channels;
A multi-superframe that includes 11. The method of claim 10,
The CFP section is
A multi-superframe comprising a plurality of superframes, comprising a first superframe of the plurality of superframes with 7 slots, and comprising 15 slots after the first superframe. transmitting, by a transmitter, a master beacon (MB) to a plurality of receivers;
allocating, by the transmitting end, a slot within a contention free period (CFP) period by exchanging information with each receiving end; and
performing, by the transmitter, wireless power transmission and wireless data transmission/reception with at least one of the plurality of receivers according to the allocated CFP slot using a plurality of channels;
A scheduling method for wireless transmission of power and data comprising a. receiving, by a receiving end, a master beacon (MB) from a transmitting end;
allocating, by the receiving end, a slot within a contention free period (CFP) period for exchanging information with the transmitting end and at least one other receiving end; and
performing, by the receiving end, wireless power transmission and wireless data transmission/reception with the transmitting end and the other receiving end according to the allocated slots using a plurality of channels;
A scheduling method for wireless transmission of power and data comprising a.

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