KR20060094430A - Method for controlling data receive and transmit in data link layer - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling data transmission and reception in a data link layer. For example, a user who is located inside or outside the home may have an RS-485 network, a small output RF network, a power line network, Through the Living Network, various home appliances such as a refrigerator or a washing machine can be controlled to operate or monitor the operating state, thereby providing a user with the convenience of remote control and monitoring. In the data link layer of a network, when performing a data transmission / reception operation between a physical layer and a network layer, by checking whether a transmission medium is used and transmitting / receiving data packets by byte, a data transmission / reception operation between layers of a living network is more efficient. Very useful inventor that can be performed with will be.

Living network control system, LnCP network, LnCP hierarchy, primitives, data link layer, data packet, transmission medium

Description

Method for controlling data transmission and reception in data link layer {Method for controlling data receive and transmit in data link layer}

1 illustrates a configuration of a living network control system according to the present invention,

2 and 3 illustrate a master-slave based communication structure applied to the present invention,

4 illustrates a hierarchical structure of an LnCP network applied to the present invention;

5 to 7 illustrate embodiments of a communication cycle service applied to the present invention.

8 illustrates a hierarchical structure of the LnCP protocol according to the present invention,

9 illustrates an embodiment of a primitive for an interface between a network management sublayer and a parameter management layer in accordance with the present invention;

10 illustrates an embodiment of an inter-layer interface structure according to the present invention,

FIG. 11 illustrates an embodiment of a universal asynchronous transmit / receive (URAT) frame structure according to the present invention.

12 illustrates an embodiment of a primitive for an interface between a physical layer and a data link layer according to the present invention;

FIG. 13 illustrates an embodiment of a primitive for an interface between a data link layer and a network layer according to the present invention;

14 illustrates an embodiment of a data link layer frame structure according to the present invention;

15 illustrates an embodiment of a data receiving method in a data link layer according to the present invention;

16 illustrates an embodiment of a data transmission control method in a data link layer according to the present invention;

17 shows an embodiment of a p-DCSMA algorithm according to the present invention,

18 illustrates an embodiment of a transmission priority according to the present invention.

※ Explanation of code for main part of drawing

100: LnCP Internet server 200: communication terminal

300: Internet 400: Living Network Control System

40: home gateway 41: network manager

42: LnCP Router 43: LnCP Adapter

44: home appliances

The present invention relates to a method for controlling data transmission and reception in a data link layer. For example, a user located inside or outside a home efficiently controls home appliances such as a refrigerator or a washing machine connected to a living network. The present invention relates to a data transmission / reception control method in a data link layer included in a living network control system.

In general, a home network refers to a network in which various digital home appliances are connected to each other so that a user can conveniently and economically enjoy life services at home or outside the home. Or various types of home appliances such as washing machines are increasingly digital.

On the other hand, home networks have been developed in recent years as operating system technology for home appliances and high-speed multi-media communication technologies have been applied to digital home appliances, and new types of information home appliances have emerged. have.

In addition, a network constructed to provide file exchange or Internet service between a personal computer (PC) and peripheral devices, a network between home appliances that handle audio or video information, and a refrigerator or a washing machine. Living networks are generally referred to as networks that are built to control various home appliances and home appliances such as home automation and remote meter reading.

In addition, the main communication purpose of the small-scale data transmission for the remote control or monitoring of the operation state of various home appliances, such as refrigerators or washing machines, etc. included in the living network In the living network service, the minimum communication resources are used, and the network managers included in the living network must be directly controlled to control the connected home appliances. As it is not prepared, the solution solution is urgently required,

Accordingly, the present invention has been made in view of the above situation, and for example, a user who is located inside or outside the home may use various household appliances such as a refrigerator or a washing machine connected to a living network, or the like. Data transmission and reception at the data link layer to efficiently control data transmission and reception between the physical layer and the network layer at the data link layer of the living network as well as to efficiently control using only communication resources. To provide a control method, the object is to.

According to an aspect of the present invention, there is provided a method of controlling data reception in a data link layer, the method comprising: receiving data transmitted from a physical layer of a living network one by one at a data link layer and temporarily storing the data; If an additional byte is not received for a predetermined time from when the one byte is received, determining that data has been received and controlling the data link layer to be in a data-receivable state; And configuring the temporarily stored data in a predetermined data format, transmitting the temporary stored data to a network layer, and then controlling the data link layer to a data reception state.

In addition, the data transmission control method in the data link layer according to the present invention, in the device of the living network, if the data is to be transmitted, step 1 of checking whether or not to use the transmission medium; If the transmission medium is not in use for a predetermined time, changing the data link layer to a data reception state, and then transmitting one byte and confirming whether transmission is successful; And if it is confirmed that the transmission is successful, three steps of transmitting a corresponding value to the network layer.

Hereinafter, a preferred embodiment of the inter-layer interface method in the living network control system according to the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a configuration of a living network control system according to the present invention. For example, a LnCP internet server 100 to which a living network control protocol (LnCP) newly defined in the present invention is applied. 1 and the living network control system 400 are connected and connected through the Internet 300 as shown in FIG. 1, and the LnCP Internet server 100 includes a personal computer (PC), a PDA, Interface operation with various communication terminals 200 such as PCS is performed.

Meanwhile, the living network control system 400 includes a home gateway 40, a network manager 41, an LnCP router 42, an LnCP adapter 43, And appliances 44, wherein the constituent means includes, as shown in FIG. 1, a non-standardized transmission of a data link layer such as an RS-485 network or a small output RF network. A medium (Non-Standard Transmission Medium) or power line communication or a data link layer such as IEEE 802.11 or ZigBee (IEEE 802.15.4) may be used as a transmission medium.

In addition, the living network control system 400 may be referred to as an 'LnCP network', for example, where the LnCP network is a home appliance belonging to the living network category in an independent home, as shown in FIG. 1. It consists of a standalone network that connects (Appliances) to a wired or wireless transmission medium.

Meanwhile, the LnCP network includes a master device capable of controlling the operation of another household appliance or monitoring an operation state, a function of responding to a request of the master device, and information about a change in its own state. A slave device having a notification function is connected.

And, the environment setting and management functions of the home appliances 44 connected to the LnCP network, as shown in Figure 1, will be in charge of the network manager 41, the home appliances 44, It may be directly connected to the network or indirectly through the LnCP adapter 43, and the RS-485 network, the RF network, and the power line network in the LnCP network are connected through the LnCP router 42. .

In addition, the LnCP network, by connecting to the external Internet 300 to provide a function that allows the user outside to check or control the status of the home appliances installed in the home, for this purpose LnCP network and external The home gateway 40 is responsible for the connection function between the Internet, and when the user accesses the LnCP Internet server 100 from the outside and performs an authentication process, the user checks the status of the home appliance connected to the LnCP network or Or the function to control can be used.

In addition, after accessing the LnCP Internet server 100 through the home gateway 40 from the home appliance connected to the LnCP network, the content provided by the LnCP Internet server may be downloaded, which is the main feature of the LnCP network. When described in detail as follows.

First of all, digital information appliances have a microcontroller with various performances so as to perform unique functions. In the LnCP network according to the present invention, the digital information home appliances can operate with such a microcontroller with various performances. In order to simplify the function more efficiently, it is possible to use the resources of the microcontroller installed in the home appliance to a minimum, and the low performance microcontroller can handle the LnCP communication function while performing the functions of the home appliance. In addition, the high performance microcontroller controller supports multitasking functions.

In addition, the main features of the LnCP network according to the present invention, the master-slave-based communication structure, event-based communication support, a plurality of network manager support, four-layer structure, communication cycle service, flexible address management, variable length packet communication, And can be classified as providing a standard message set.

Meanwhile, the master-slave based communication structure is used as a connection communication structure between home appliances in the LnCP network, and there must be at least one master device, and the master device includes information on slave devices to be controlled and In this case, the master device controls another slave device according to a program already input or receiving input from a user.

For example, the message flow between the master device and the slave device, as shown in Figure 2, by sending a request (Request) message from the master to the slave, by sending a response message to the slave (Response) to the master In operation, the LnCP network may have a multi-master and multi-slave based communication structure, as shown in FIG. 3.

In the LnCP network, an event-driven communication service is supported, for example, a user may set an event required by the home appliance, and then, in the home appliance, perform an arbitrary operation. In the meantime, when an event set by the user occurs, the fact or content of the event is notified to another home appliance or, in response to the event, the operation state of the other home appliance is controlled.

In addition, the LnCP network includes at least one network manager that is responsible for environment setting and management functions of home appliances, and may support multiple network managers as needed. In order to prepare for errors, management information of home appliances should be synchronized.

In the LnCP network, as shown in FIG. 4, a four-layer structure of a physical layer, a data link layer, a network layer, and an application layer is illustrated. In the LnCP network, a service is provided in units of communication cycles. In a slave device, only one communication cycle may exist at a given time.

That is, while a communication cycle is performed in one slave device, it cannot be controlled by any master device, but in the master device, a plurality of communication cycles for a plurality of slave devices may be performed at a given time. There are four types of cycles: {1-Request, 1-Response}, {1-Request, Multi-Response}, {1-Notification}, and {Repeated-Notification}.

For example, in the {1-Request, 1-Response} communication cycle, one master transmits one request packet to one slave, and the slave responds with one response packet ( As a communication cycle for transmitting a response packet, if an error occurs in the received packet, as shown in FIG. 5, the master transmits a re-request packet, and the slave responds to the response packet. (Response Packet) will be delivered again.

In addition, in the {1-Request, Multi-Response} communication cycle, as shown in FIG. 6, one master transmits one request packet having a group address to multiple slaves, and each slave transmits a request packet. The master will end the cycle when the maximum allowed time is received, and the master will ignore the error even if an error occurs in the response packet received from the slave.

The {1-Notification} communication cycle is a cycle in which the master device transmits one notification packet to one or more devices and immediately terminates communication, as shown in FIG. 7. The {Repeated-Notification} communication cycle is a cycle for terminating communication after repeatedly transmitting the same packet in order to secure transmission reliability in the {1-Notification} communication cycle.

Meanwhile, in the PnCP network, flexible address management is supported. For example, home appliances equipped with the LnCP function are assigned at the time of factory shipment to automatically configure the network without user intervention. In this case, since the same kind of home appliances are initialized to the same address, the network manager has an algorithm for assigning a unique unique address when the home appliances are connected.

In addition, in the LnCP network, by assigning a unique group address to the home appliances belonging to the same type, it is possible to enable group communication using a single message, clustering various types of home appliances according to the user's needs You can classify as (Cluster) and assign a group address to each cluster.

In the PnCP network, packet communication of variable length is supported, for example, in the case of downloading content such as an application program related to the operation of a home appliance or uploading data stored in the home appliance, The length of the packet is adjusted using the buffer size information of the home appliance.

In addition, the LnCP network provides a standard message set. For example, the message layer defines a standard message set suitable for various home appliances in the application layer so that the master device can control another home appliance. Common Area Message Set for basic LnCP communication, Product Application Area Message Set to support the unique functions of home appliances, and Developer Area to provide unique functions of manufacturers It is divided into a Developer Area Message Set.

On the other hand, the message set as described above may be extended as needed, and may also add an argument to a previously defined message, hereinafter, one of the main features of the LnCP network according to the present invention, a hierarchical structure It will be described in more detail.

FIG. 8 illustrates a hierarchical structure of the LnCP protocol according to the present invention. As described above, in the LnCP network to which the present invention is applied, for the operation control and monitoring of home appliances such as a refrigerator or a washing machine, a physical layer, It has a four-layer structure of data link layer, network layer, and application layer.

Meanwhile, the physical layer provides a physical interface between devices and a function of transmitting and receiving a physical signal such as a bit to be transmitted. The physical layer includes a data link such as RS-485 and a small output RF. Non-standardized transmission media and standardized wired and wireless transmission media such as powerline communications, Ethernet, IEEE 802.11, and ZigBee can be used. In order to implement the physical layer of the device in the LnCP network, a separate physical layer may be used as an LnCP adapter. Can be used.

The Data Link Layer provides a medium access control (MAC) function for using a shared transmission medium. In the LnCP network, the data link layer is de-standardized. When using a transmission medium, pba-DCSMA (probabilistic Delayed Carrier Sense Multiple Access) should be used as the medium access control (MAC) protocol.

Meanwhile, the p-DCSMA checks whether a transmission medium is in use, suspends transmission if it is in use, and executes a transmission procedure if it is not in use, thereby allowing each device to share the transmission medium. Is a medium access control protocol,

However, in the LnCP network, when the data link layer uses a standardized transmission medium, the medium access control function defined in the protocol can be used.

On the other hand, as shown in Figure 8, the Home Code Control Sublayer is a separate code, when the LnCP network is configured using power line communication or non-independent transmission media such as IEEE 802.11, ZigBee, and low power RF. It provides a function of setting, managing, and processing a home code for logically dividing a network. The home code control sublayer is configured to physically separate individual networks by a standalone transmission medium such as RS-485. In this case, it is preferable not to implement.

The network layer provides functions such as address management and transmission / reception control of home appliances for reliable network connection between devices, and the application layer provides services of application software. In order to perform, it provides a transmission and reception control function, and also provides a flow control function for a download and upload service.

In addition, the application layer defines a message set for network management or control and monitoring of the home appliance, the application software performs a unique function of the home appliance, and through the interface defined in the application layer In this case, data exchange with the application layer is performed.

As shown in FIG. 8, the network management sublayer provides a parameter management function for setting a parameter and a network management function for network configuration and management. The Parameter Management Layer may set or read parameters used in each layer according to the requirements of the network management sublayer.

In addition, primitives for interfacing with the network management sublayer may include primitives for passing parameter values from the network management sublayer to the parameter management layer, as shown in FIG. For example, there is a structure GetPar for passing parameter values from the parameter management layer to the network management sublayer.

On the other hand, the primitive (structure SetPar) for passing the value of the parameter to the parameter management layer, 'uchar DestLayer' indicating the layer to pass the parameter value, and the value of the layer-specific parameters according to the DestLayer value 'structure SetLayerPar' is recorded, and the DestLayer has a layer to which parameter values are to be transmitted, '1' for application layer, '2' for network layer, '3' for data link layer, and physical layer. If it is '4'.

The SetLayerPar becomes 'SetALPar' for an application layer, 'SetNLPar' for a network layer, 'SetDLLPar' for a data link layer, and 'SetPHYPar' for a physical layer.

In addition, a structure GetPar for passing a parameter value to the network management sublayer includes a 'uchar SreLayer' indicating a layer that transmitted the parameter value, and indicating whether the parameter value was successfully taken from each layer. 'uchar PMLResult' and 'structure GetLayerPar', whose value varies depending on the SrcLayer value, are recorded as layer-specific parameters. In the SrcLayer, if the layer transmitting the parameter value is an application layer, '1', the network '2' for the layer, '3' for the data link layer, and '4' for the physical layer.

The PMLResult becomes PAR_OK (1) when the parameter value is successfully taken from each layer, and PAR_FAILD (0) when the parameter value is not taken successfully, and the GetLayerPar is 'RptALPar' when the application layer is used. It is 'RptNLPar' for the layer, 'RptDLLPar' for the data link layer, and 'RptPHYPar' for the physical layer.

On the other hand, the parameter used in the parameter management layer is 'const unit ParTimeOut', which waits to receive RptALPar (or RptNLPar, RptDLLPar, RptPHYPar) after passing GetALPar (or GetNLPar, GetDLLPar, GetPHYPar) to each layer. Represents the time (ms).

When the parameter management layer receives the SetPar primitive from the network management sublayer, the parameter management layer delivers the SetALPar, SetNLPar, SetDLLPar, or SetPHYPar primitive to the layer specified in the primitive, and in each layer, all bit values are '1'. Variable is ignored (eg 0xFF, 0xFFFF).

In addition, if a GetPar primitive is received from the network management sublayer, GetALPar, GetNLPar, GetDLLPar, and GetPHYPar are delivered to the layer specified in the primitive, and if a RptALPar, RptNLPar, RptDLLPar, or RptPHYPar is received from each layer, the GetPar primitive is included. In this case, the PARResult value is transmitted to the network management sublayer with PAR_OK. If the primitive is not received from each layer within the ParTimeOut time, the PARResult value is transferred to the network management sublayer with PAR_FAILD.

On the other hand, the network management sublayer provides a parameter management function for setting parameters (Node Parameters) in individual devices and a function for network configuration, environment setting, and network operation management. When requested from the software and master, the parameter management layer sets or reads the following parameter values in the layer.

For example, set the parameter values of AddressResult, NP_Alivelnt, SvcTimeOut, NP_BufferSize, NP_LogicalAddress, NP_ClusterCode, NP_HomeCode, SendRetries, MinPktInterval for the data link layer, and NP_bps for the physical layer, for the application layer. Or read.

In particular, if the slave's network management sublayer receives a UserReqRcv primitive containing an application service belonging to the 'device node parameter setting service' or 'device node parameter acquisition service' from the application layer, The parameter value is set or read in the layer, and the result is transmitted to the application layer through the UserResSend primitive. Application services for parameter management by layer are as follows.

For example, for the application layer, SetOption service, SetAliveTiem service, SetClock service, GetBufferSize service, Network layer, SetTempAddress service, SetAddress service, GetAddress service, Data link layer. There is a SetSpeed service.

On the other hand, the network management sublayer provides network management functions, such as configuration of LnCP networks, environment settings, and operation management of the network. The general network management functions operate on a master application layer, and provide a plurality of network management periods. Some of the network information synchronization functions operate on the slave's application layer.

The interface with the application layer includes an interface between the slave application layer and the slave application layer. In the interface with the slave application layer, UserReqRcv and UserResSend primitives are used. The interface with the application layer is UserReq, UserDLReq, UserULReq. You will use the UserRes, UserEventRcv, and ALCompleted primitives.

On the other hand, the inter-layer interface method in the living network control system according to the present invention, as shown in Figure 10, the header required for each layer in the protocol data unit (PDU: Protocol Data Unit) received from the upper layer ( Header and trailer information are combined and delivered to the lower layer.

For example, an application layer PDU (APDU) is a packet transmitted between an application layer and a network layer, and is composed of an APDU header and a message. The network layer PDU (NPDU) is a network layer and a data link layer or a home code sublayer. It is a packet transmitted between the APDU and its own address, the address of the destination home appliance, and an NPDU header such as a packet type according to the importance of a message to be transmitted, an NPDU trailer, and an APDU.

The Home Code Control Sublayer PDU (HCNPDU) is a packet transmitted between the network layer and the data link layer, and is composed of an NPDU and a home code. In the physical layer of an LnCP network, an interface between a device and an LnCP adapter or an LnCP router is defined. To this end, as shown in FIG. 11, a universal asynchronous receiver and transmitter (UART) frame structure is used.

For example, a packet sent from a higher layer is converted into a UART frame unit of 10 bits and transmitted through a transmission medium. In an LnCP network, a UART frame includes one start bit, eight bits of data, It consists of a stop bit of 1 bit, does not use a parity bit, and the UART frame is transmitted from the start bit to the stop bit in order.

On the other hand, when the UART is used in the LnCP network, no additional frame header and frame trailer are used, and the communication speed may be 9600bps or 4800bps or 19200bps depending on the performance of the device.

As shown in FIG. 12, the primitive for the interface between the physical layer and the data link layer includes a primitive 'FrameSend' for transferring one byte of data from the data link layer to the physical layer, and the data link layer in the physical layer. There is a primitive 'FrameRcv' for transmitting one byte of data, and 'RptLineStatus' of the line status delivered to the data link layer. If there is a UART frame on the line, LINE_BSY is transmitted. Otherwise, LINE_IDLE is transmitted.

On the other hand, as shown in FIG. 13, the primitive for the interface between the data link layer and the network layer includes a primitive 'PktSend' for transferring the packet from the network layer to the data link layer, and a packet from the data link layer to the network layer. There is a primitive 'PktRcv' for delivery and a primitive 'DLLCompleted' for reporting the result of packet transmission from the data link layer to the network layer.

In the PktSend, the packet of the network layer (NPDU / HCNPDU), the byte data length of the NPDU / HCNPDU, and the transmission priority (SvcPriority) are recorded. In the PktRcv, the packet of the network layer (PDU) and PDU The byte data length of PDULength is recorded.In the DLLCompleted, SEND_OK (1) is written if the packet transmission process is successfully completed as a packet transmission result (DLLResult), otherwise SEND_FAILED (0), and DLLResult is SEND_FAILED (0). In case of, the value (DLLFailCode) which classified the cause of failure is recorded.

On the other hand, as shown in Fig. 14, in the data link frame structure, a frame header and a frame trailer are additionally configured in the NPDU / HCNPDU, and a data link layer uses a non-standardized transmission medium. In this case, a null field is recorded in the frame header and the trailer, and when a standardized transmission medium is used, the specification specified in the corresponding protocol is followed. The NPDU field is a data unit delivered from an upper network layer.

The HCNPDU is a data unit in which a home code used when the physical layer is a non-standalone transmission medium is added to the front of the NPDU, and the data link layer does not distinguish between the NPDU and the HCNPDU.

Meanwhile, a data transmission and reception control method in the case where the data link layer uses a non-standardized transmission medium will be described in detail as follows.

First, FIG. 15 illustrates reception of data at the data link layer. If the data link layer is in a receivable state capable of receiving data, the data link layer receives data one byte by using a FrameRcv primitive from the physical layer. Each time a byte is received, the corresponding data is stored in a buffer of the data link layer.

If no additional bytes are received within a predetermined time, for example, FrameTimeOut, from the time when the one byte is received, it is determined that packet reception is completed. In this case, in the data link layer, data of the packet received from the physical layer is determined. The size and data errors are not judged.

On the other hand, when the data packet reception is completed, during the MinPktInterval, after controlling and maintaining the data link layer to the data unreceivable state, and configures the NPDU to pass to the network layer, the reason for maintaining the unreceivable state is, This is to prevent a new byte from being transmitted from the physical layer while processing a message, and then after a predetermined time, for example, MinPktInterval, the data link layer is changed to a state in which data can be received.

FIG. 16 illustrates data transmission in a data link layer, wherein a device to transmit data checks a state of a transmission medium by using an RptLineStatus primitive, which is a primitive of a line state transmitted to the data link layer (S10). For example, if a transmission medium is not currently in use (e.g. LineStatus = LINE_IDLE), the device will continue to check the status of the transmission medium during MinPktInterval and if it is detected that the transmission medium is in use (e.g. LineStatus = LINE_BUSY), repeat the status check procedure of the transmission medium.

If the transmission medium is not in use during the MinPktInterval (S11), the size of the contention window (Wc) is determined according to the priority (SvcPriority) of the packets included in the NPDU / HCNPDU, and uniform distribution within the range of Wc. Generates a RandomDelayTime value (S12), and continuously checks the state of the transmission medium for the RandomDelayTime time (S13).

On the other hand, if the transmission medium is not in use during the RandomDelayTime time (S14), in order to detect a packet collision, the packet is transmitted after changing the data link layer to a data reception state (S15), and when transmitting one byte Each transmitted byte is compared with the received byte to check whether the transmission is successful (S16). For example, if the packet transmission is successful, the DLLCompleted primitive including SEND_OK is transmitted to the network layer (S17).

On the other hand, if the two values of the transmitted byte and the received byte are not the same, it is determined that a collision has occurred, and the p-DCSMA algorithm retries. The p-DCSMA algorithm has a cumulative count of retry counts than BackOffRetries. While small (S18), retry is only for MACExecTime.

When the p-DCSMA algorithm is retried, the upper limit of Wc is increased by WindowShift (e.g. 0,1,2,6), which is defined differently according to SvcPriority. (S18) Or, if the packet transmission is not successful within the MACExecTime time (S19), the DLLCompleted primitive including SEND_FAILED is delivered to the network layer (S20).

On the other hand, as shown in Fig. 17, the p-DCSMA algorithm causes, for example, that devices B, C, and D that are ready to transmit while device A is transmitting a packet wait until the transmission medium is not in use. When the packet transmission of the device A is completed, the devices B, C, and D wait for MinPktInterval and then generate a RandomDelayTime defined according to SvcPriority.

For example, if device C generates the smallest RandomDelayTime, device C sends the packet, devices B and D wait until the transmission medium is not in use, and when device C completes packet transmission, After D performs the p-DCSMA, the device D, which won the contention, sends the packet.

Meanwhile, the probability of transmitting a packet in the p-DCSMA is determined according to the size of the contention window (Wc), and the higher the transmission priority (SvcPriority), the higher the probability of transmission should be. The transmission priority for determining the Wc is a value estimated from the point of view of the home appliance user of the importance of messages that one or more devices are trying to transmit simultaneously or at a similar time, and also has a high (low) priority value. Means that the waiting time for a packet to be sent is not short (long) but rather short (long).

The Wc may be set according to the SvcPriority included in the NPDU / HCNPDU, as shown in FIG. 18. A packet having a high priority is higher than a packet having a priority below a serious injury. A packet having a medium high or medium low priority is set to be always transmitted compared to a packet having a low priority.

In addition, in order to increase the transmission probability of a packet having a high occurrence time, the p-DCSMA algorithm increases the upper limit of Wc for each priority by a predetermined WindowShift for each retry.

As described above, preferred embodiments of the present invention have been disclosed for purposes of illustration, and more various home appliances can be connected and connected to a living network to which the present invention is applied. Within the technical spirit and scope of the present invention disclosed in the above, other various embodiments may be improved, changed, replaced or added.

The data transmission and reception control method in the data link layer according to the present invention configured and configured as described above may include, for example, an RS-485 network, a small output RF network, and a power line installed in a home by a user located inside or outside the home. Through a living network such as a network, various home appliances, such as a refrigerator or a washing machine, can be controlled or monitored, thereby providing a user with convenience of remote control and monitoring. In addition, when performing a data transmission / reception operation between a physical layer and a network layer in the data link layer of the living network, by checking whether a transmission medium is used, transmitting and receiving data packets one by one, thereby transmitting and receiving data between layers of the living network. To make your actions more efficient. It will be very useful inventions.

Claims (13)

A step of temporarily storing data transmitted from the physical layer of the living network, one byte at a data link layer and temporarily storing the data; If an additional byte is not received for a predetermined time from when the one byte is received, determining that data has been received and controlling the data link layer to be in a data-receivable state; And And controlling the data link layer to a data reception state after configuring the temporarily stored data in a predetermined data format and transmitting the data to the network layer. Way. The method of claim 1, In the first step, the data packet transmitted from the physical layer is received and temporarily stored one by one by using a frame reception (FrameRcv) primitive, characterized in that the data link control method in the data link layer. The method of claim 1, In the second step, if an additional byte is not received for a preset FrameTimeOut time from the time point at which the one byte is received, the data packet layer determines that the data packet has been received. Receive method. The method of claim 1, In step 3, the temporary stored data is configured as a network layer protocol data unit (NPDU) and transmitted to the network layer. After the minimum packet interval (MinPktInterval) time has elapsed, the data link layer is controlled to a data reception state. And a data receiving method at the data link layer. In the device of the living network, when the data is to be transmitted, checking whether a transmission medium is used; If the transmission medium is not in use for a predetermined time, changing the data link layer to a data reception state, and then transmitting one byte and confirming whether transmission is successful; And And transmitting the corresponding value to the network layer, if the transmission is confirmed to be successful. The method of claim 5, In the first step, when a device of a living network intends to transmit data, the data link layer determines whether a transmission medium is used by using a line status (RptLineStatus) primitive transmitted to the data link layer. Data transmission control method in. The method of claim 6, If the transmission medium is not currently in use, the device continuously checks the status of the transmission medium for a minimum packet interval (MinPktInterval), and if the transmission medium is in use, repeats the operation of checking the status of the transmission medium. A data transmission control method at a data link layer. The method of claim 7, wherein If the transmission medium is not in use during the minimum packet interval (MinPktInterval), the contention window (Wc) is determined according to the priority (SvcPriority) of the data packet, and a uniform random delay time (RandomDelatTime) value is generated. And a method for controlling data transmission at the data link layer, the status of the transmission medium being confirmed. The method of claim 5, In the second step, after changing the data link layer to a data reception possible state, each time one byte is transmitted, the data link layer is checked whether the transmission is successful by comparing the transmitted byte with the received byte. Data transmission control method in. The method of claim 5, In step 3, if the transmission is confirmed to be successful, the data transmission control method of the data link layer, characterized in that to transmit a primitive including a transmission OK (Send_OK) to the network layer. The method of claim 5, Checking whether the transmission is successful, and if it fails, checking whether the transmission medium is in use, reserving the transmission if it is in use, and retrying an algorithm for executing the transmission procedure if not in use. A data transmission control method in a data link layer characterized by the above-mentioned. The method of claim 11, When the data link layer uses a non-standardized transmission medium, the algorithm is p-DCSMA (probabilistic Delayed Carrier Sense Multiple Access) algorithm as a medium access control (MAC) protocol. Control method. The method of claim 11, Forwarding a primitive including a transmission failed (Send_Failed) to the network layer if the number of times of retrying the algorithm is equal to or more than a predetermined number of times or if data transmission is not successful within the media access control execution time. And a data transmission control method at the data link layer.

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