KR100560747B1 - method for transmission of medical data using medical rabel - Google Patents

Abstract

According to the present invention, when transmitting and receiving various medical data between medical devices connected through a network, the transmission priority is defined according to the characteristics of the data, and the data is transmitted according to the transmission priority. When there are several medical data to be transmitted, the data with the highest transmission priority is processed in order, so that even if the data traffic is congested, data can be transmitted and received for medical data with high transmission priority and therefore urgent and reliable. Effectively support the quality of care provided.

Medical data, PACS, medical labels,

Description

Method for transmission of medical data using medical rabel}             

1 is a block diagram of a medical network system for providing medical services.

2 is a field configuration diagram of an IP header.

3 is an exemplary diagram of packet classification.

4 shows a TOS field in an IP packet.

5 is a table for setting priority items of an IP packet.

6 is a diagram for explaining a PQ scheme in a traffic scheduling algorithm.

7 is a diagram for explaining a WFQ scheme in a traffic scheduling algorithm.

<Description of Symbols for Main Parts of Drawings>

200: Hospital 210: PACS System

220: medical equipment 230: film digitizer

240: PC 250, 350: VPN writer

The present invention relates to a network system for a telemedicine service, and since the reliability and urgency of the medical data should be reflected, when the medical data is transmitted and received for the telemedicine service, the data for the medical service is reflected. The present invention relates to a medical data transmission method for a network system implemented with a communication network.

In recent years, laser scanners that can digitize medical equipment and films introduced with computers have been developed so that medical images of patients can be stored on computers. Digitalized medical images can be easily stored, viewed, handled and transmitted.

Telemedicine service technology transmits these digitalized medical images from a transmission site to a remote location by using a computer and a communication network so that a radiologist or a related doctor can be treated at a long distance. The most common transmission site is a hospital. The remote is the doctor's home or office.

BACKGROUND With the development of telemedicine service technology, technologies for delivering medical data over a network have been developed. In particular, methods for effectively delivering medical image data such as computed tomography (CT), magnetic resonance imaging (MRI), and X-ray have been proposed.

In the Republic of Korea Patent No. 155803 (name of the invention: a telemedicine diagnosis system), a transmission means for transmitting a destination having an image or radiation equipment is composed of a scanning unit, an image conversion unit, a region of interest display unit, a compression unit, a transmission unit, Remote receiving means with a radiologist consists of an automatic receiving and filing unit, a restoration unit, a display unit and an image processing unit.

Therefore, the compression can be performed by a compression method selected according to the type of image to be transmitted to the remote location or the urgency of patient diagnosis. The automatic reception and filing function of the remote location facilitates the transmission and reception of the image as well as the remote doctor. The image files can be selected and diagnosed one by one, and the transmitted images can be automatically received and stored even if the doctor is currently doing other work on the computer.

The Republic of Korea Patent No. 319912 (name of the invention: a remote medical diagnosis system and a remote medical image transmission and reception method) has not only an X-ray image but also an MRI, a CT, an ultrasound diagnostic device, etc., when performing a medical diagnosis, multi-image Efficient transmission and lossless compression, lossless compression, and compression based on the region of interest can be achieved, depending on the type of image to be transmitted to the remote location or the urgency of patient diagnosis.

Korea Republic Patent No. 378354 (name of the invention: a remote medical diagnosis system and a remote medical image transmission and reception method) includes a medical image acquisition unit that acquires a medical image from an X-ray imager, an MRI, a CT, and an ultrasound diagnostic apparatus at a transmission site. And an image converter for converting the medical image generated by the medical image obtaining unit into a computer internal format, a region of interest display unit for displaying the region of interest on the medical image converted by the image converter, and a region of interest displayed on the region of interest display. An image receiving unit for receiving the medical image transmitted through the ATM transmission network in accordance with the transmission protocol, and converts the received transmission data into a computer internal format, and a display unit for displaying the image data received from the image receiving unit on the screen. Therefore, ATM communication network is used to transmit medical images of patients, so all kinds of images can be transmitted to a remote place almost simultaneously with the start of transmission, so that it can cope quickly with emergencies. Can be achieved.

The medical network for the transmission of various medical data including such image medical data is being constructed with IP network equipment as the current communication environment is advanced to the IP (internet protocol) network environment.

However, the conventional IP network equipment has problems such as packet forwarding delay and packet loss when a large network load occurs, which is not suitable for medical networks requiring high reliability.

In the conventional case, there are techniques such as multi protocol label switching (MPLS) to ensure reliability in data networks.

So far, the common network technology paradigm has been how fast data can be sent. Therefore, as the network infrastructure has evolved, the protocol procedure for transmitting and receiving data has become more concise, and the shortest distance is selected as the optimal path even in the routing protocol for determining the path of data in the network.

However, with the rapid growth of the Internet, service providers and subscribers require not only the size of traffic volume but also value-added services, and the existing routing technology has limitations, requiring a new concept technology. The technology trends to date have evolved to accommodate both the flexibility of existing IP networks and the QoS advantages of ATM networks. However, in the process of integrating IP and ATM, new technologies are needed to solve the protocol complexity and implementation difficulties, and to more efficiently respond to the scalability requirements. )to be.

MPLS is a fast switching technology that delivers IP data based on a label rather than an IP address by attaching a new addressing system called a label in front of the IP packet address. It labels IP packets as they enter the MPLS network and replaces them in the middle. And remove it again when you leave. As such, MPLS technology using labels and protocols has the advantages of high speed transmission, easy QoS application, multiple traffic paths, network load reduction and redundancy, and VPN (Virtual Private Network) operation. .

In particular, MPLS is expected to be applied to the field of virtual private network (VPN) service. In other words, MPLS not only ensures independent security for each subscriber, but also does not require end-to-end VPN configuration, subscribers can easily add and move, and support QoS required.

However, such MPLS is a general technique for guaranteeing the QoS of data, and there is no suggestion on how to guarantee the QoS required to perform a medical service.

Accordingly, an object of the present invention is to provide a medical data transmission method using a medical label that guarantees an optimal quality of service for effectively performing a medical service in a transmission process of various medical data on a network configured to perform a remote medical service. There is this.

In order to achieve the above object, the present invention prioritizes each medical data according to the characteristics of each medical data when processing various medical data generated in a network environment while performing various medical services. The characteristics of each medical data are given a medical label considering the priorities according to various medical situations such as the type of medical data, medical alert, medical treatment, and urgency, and the data is transmitted, and the data is transmitted according to the priority according to the label. Perform processing on the medical data.

In addition, when transmitting from the network supporting the medical label to the external IP network that does not support the medical label, the gateway converts the medical label into a conventional QoS protocol such as MPLS and transmits the medical label.

Also, in an emergency situation where a large amount of casualty is required in a specific area such as a large amount of casualties, all other data in the network equipment buffer may be discarded and only the corresponding medical data may be transmitted.

Before explaining the medical data transmission processing method using the medical label according to the present invention with respect to the overall configuration and operation of the medical system that provides the internal medical service and remote medical service by connecting various medical equipment through the network in the hospital Let's look first.

1 is a configuration diagram of a medical network system. Referring to FIG. 1, a medical network system includes a medical device 220 for treating a patient, a film digitizer 230 that scans a film taken by the patient from the medical device 220, and a film digitizer 230. The PACS system 210 converts the scanned image image file and the image image file photographed directly by the medical equipment 220 and transmits the image image file to an external network, and the video conference system 260 which consults with a doctor of another hospital through video. And a VPN router (Virtual Private Network Router) for preventing information leakage to the patient.

When doctors transmit medical information such as medical history, current health condition, medical log, and medication status for a patient to the PACS system 210 via the PC 240, the PACS system 210 stores the database in its database. In this case, the medical information includes an image image file and a text file of the patient, and the image image file is transmitted using the DICOM 3 protocol, which is a standard protocol of the medical industry. Here, the image image file may be scanned by a film digitizer 230 or a film taken by a medical device 220 such as magnetic resonance imaging (MRI), computed tomography (CT), or the like. Image data taken directly from the same medical equipment 220.

The PACS system 210 is a system for inputting and storing various medical images used in a hospital, for example, an X-ray imaging apparatus, an ultrasound image diagnosis apparatus, a CT apparatus, an MRI apparatus, and transmitting and outputting them to a desired place.

The VPN router 250 is based on an Internet-only line such as an Asymmetric Digital Subscriber Line (ADSL), but may cause security problems. Therefore, the VPN router 250 employs a VPN protocol and a firewall system to crack or crack a cracker or a hacker. VPNs use a technique called tunneling to prevent intrusion or leakage of information from outside. The tunneling technology is a technology that sends and receives information by forming a virtual tunnel that is not affected by the outside on the Internet network.

Each device of the network system transmits and receives various data connected through the network. In this case, the data output from one device on the network may include the physical address, protocol type, and Internet protocol source / destination address of the corresponding network device including medical data generated from the corresponding device for medical service.

For example, hospitals have various departments. Receiving department that accepts patient care, Department of Health Affairs, which calculates application fee or calculated medical expenses after reception, Emergency department for emergency patients, Medical department of each department, Radiology department, CT room, MRI room, Inpatient room, Floor care In fact, there may be conference rooms. Network equipment is installed in these various departments. Therefore, the medical data generated from each network device has information about the physical address where the network devices are installed or the destination address to which the generated medical data should be transmitted.

Accordingly, scheduling of data traffic is required when various medical data generated from various medical equipments are put on the network. At this time, it is necessary to decide which medical data should be prioritized by reflecting the characteristics of the medical data.

For example, various medical situations may be considered, such as types of medical data, medical alerts, medical procedures, and urgency.

For example, medical data generated in the reception desk or the business department is important data, but the urgency may be less. On the other hand, data generated in the emergency room or operating room may be urgent and important data. Therefore, higher priority can be set for data generated in an emergency room or an operating room.

In addition, the medical data generated in each imaging room may have a lot of image data. In general, the file size of such image data is large. In the case of image-related media such as X-ray, CT, MRI, and DSA, for example, X-ray needs 6MB per sheet and CT requires 25MB per sheet.

In addition, medical data transmitted through each network device includes medical record data and examination report data written by a doctor, clinical information, and electronic medical record data such as nursing data described by a nurse, biosignal data such as ECG and EEG, and medical image data. There may be research data on information processing and knowledge processing to extract new information from the genome, search for the relationship between genome-related information, environmental information and lifestyle information.

There may also be telemedicine information. Telemedicine data can be classified according to the type of delivery information, the reason or purpose of delivering the information, and the way the information is delivered.

First, looking at the classification according to the type of information delivered, most of the telemedicine today is provided in the form of multimedia data including all data, such as text, sound, video. Today's telemedicine is more valuable than traditional telemedicine, which can deliver clinical trial information and imaging data (X-rays, MRI files, etc.), and transcend this information beyond time and space using mobile computers and communication devices. Remote medical care can be performed by exchanging medical information.

In addition, there may be various situations in performing telemedicine as follows.

Remote consultation (doctor-to-doctor): A remote doctor consults a local doctor through a telecommunication network (medical knowledge or skills), and in the form of one-to-one (1: 1) or one-to-many (1: N) Consult the liver.

Treatment and prescription by remote examination (between doctor and patient): The doctor analyzes the telemetry results such as electrocardiogram, blood pressure, pulse, body fat, and blood sugar through the information communication network, and conducts the treatment and prescription of remote patients according to the results. do.

Remote consultation (doctor and patient): The doctor consults a remote patient through an information network.

Telesurgery: A remote doctor will consult with a local doctor and give instructions to a local patient.

Remote treatment: The remote doctor conducts the treatment locally by a doctor or medical person.

Telemedicine education: Medical education for doctors and medical students is provided through the use of information and communication technology for lectures of remote doctors and surgery of remote doctors.

Tele-Nursing: The nurse at the remote site consults or instructs the local caregiver or guardian to provide care for the patient. In recent years, there has been an increasing tendency for specialists in radiology, cardiology, surgery, and dermatology to introduce telemedicine, while the American Telemedicine Association offers telemedicine services to prison inmates, soldiers or astronauts. Considered to be an area of.

Depending on when telemedicine is implemented, it can be classified into various situations.

Telemedicine is possible in a real-time and asynchronous manner. Real-time telemedicine is possible through real-time consultation by video between the doctor and the patient, and the doctor must be present for telemedicine.

However, asynchronous telemedicine may use different store-and-forward technology to transmit or receive audio, video, still images, data, etc., and this method is a real-time telemedicine method. There is an advantage that can save time and provide cost-effective medical care.

In addition, there may be various types of examination information. The examination information may include basic health information, initial medical information, and main examination information. Basic health information includes information on the patient's age, sex, height, weight, blood type, blood pressure, obesity, smoking status, medical history, etc. It may include information about the current state of care at the time of initial care, information about medical history symptoms, and information about the medical findings of the attending physician.

The results of the examination include information on the current state of examination, information on medical history symptoms, and the findings of the doctor's examination. The disease information includes information on the development and recurrence of various diseases. The information may include information on characteristics of each disease, information on incidence rate by age group, information on recurrence rate, and information on incidence according to lifestyle.

Even if there is a medical data inquiry request on the network through any medical equipment, the service grade can be adjusted according to which equipment is the network equipment requesting the inquiry. That is, when there is a request for medical data from network equipment installed in an emergency room or an operating room, the data is transmitted with the highest priority.

In addition, it may vary depending on a situation where medical data is required as well as a place where network equipment is installed. In other words, even if the network equipment installed in any place, not the emergency room or the operating room, it is possible to perform data transfer processing with the highest priority when requested at the time of emergency and emergency.

Therefore, the medical equipment connected to the entire hospital medical network system through the network should be able to send its own physical address information, current status information, etc. when transmitting any IP packet. That is, among the several service quality grades set in the network, the one to which one belongs must be set. When setting the quality of service, network equipment may be arbitrarily set, and a given quality of service may be allocated. That is, the case of arbitrarily setting in the network equipment refers to the case where the user of the network equipment manually sets the quality of service according to the current situation. On the other hand, the case where a given quality of service class is assigned refers to a case where the quality of service class is assigned on the network according to the address of the network device itself or the destination address.

As such, various medical data are prioritized according to their importance, and an IP header added to an IP packet to transmit data according to the transmission priority is called a medical label.

Therefore, when medical data is generated from any medical device and transmitted to another medical device through a network, the service quality grade is set for the medical data and the corresponding service quality grade is set. When the medical data is to be transmitted to another medical device through a network, a medical label header is generated that includes information for indicating a quality of service level in the TOS field of the IP header to indicate the set quality of service level. Then, the medical data may be segmented into a predetermined size, and the generated medical label header may be added to generate a packet for transmission and transmitted on the network.

On the other hand, various network devices connected to the network reads the medical label header information included in the packet when the arbitrary packet flows into the network, and extracts the data transmission priority of the packet from the medical label header information. The medical data is then processed by the traffic scheduling algorithm according to the extracted data transmission priority.
Meanwhile, when the network supporting the medical label is delivered to an external IP network that does not support the medical label, the gateway converts the medical label into a QoS protocol of MPLS (multi protocol label switching) and transmits it.

As a method of adding a medical label to an IP packet, a newly defined method using an existing IP packet format may be used. Or you can use a proprietary protocol that adds a separate label. When using a dedicated protocol to add a separate label, it can be divided into several levels according to the characteristics of the medical data, for example, the type of medical service and the urgency of medical treatment. On the other hand, in the case of using a previously defined IP packet format, it is possible to define and use a quality of service grade of medical data so as to fit in a predefined field.

Among the various methods of defining the quality of service quality of medical data, a method of defining the quality of service quality of medical data using fields already defined in the IP packet will be described.

In order to transmit medical data between devices connected through a network, the TCP / IP protocol must first bundle this data into IP packets before transmitting medical data from each device.

An IP packet has one or more headers. This header is called the IP header, sometimes called the Layer 3 or network header. An IP header is a series of bits grouped into fields according to the aggregate size. All IP headers have the same structure and differ depending on which set is set to "1" to determine the field value or to represent the binary in the field. Let's take a closer look at the fields in the IP header.

2 shows each configuration field of an IP header. 2, there are 14 fields in an IP packet. Each field is as follows.

The Version field is a 4-bit field and means a binary IP version. If you are using IPv4, the bit is set to 0100. If you are using IPv6, the bit is set to 0110.

The IHL (header length) field is a 4-bit field that indicates the length of the IP packet header, which is used to identify which part of the IP packet is the header and which part is the actual data. 1, it can be seen that the width of an IP packet is 32 bits. Let's look at the length of the packet. The data is not part of the header and the options are optional, but other fields are required. So the header must be at least five 32-bit words, or binary 0101. The words may be represented in bytes. In this case, 1 word corresponds to 4 bytes (1 byte is 8 bits), and 5 words are 20 bytes of header length. If used, the header will be at least six 32-bit words long. Since this field is 4 bits, the minimum length is 2 ^4-1 , or 15. This limits the length of an IP packet to 60 bytes (4 bytes is 1 word).

The length of the Type of Service flag field is 8 bits. The first three bits are priority bits and the last five bits represent a service type flag. This flag was originally created to determine which packets to forward and which packets to leave when the router is busy. Since then, other protocols have the ability to prioritize traffic, and routers ignore most of them even if the flag is set.

The Full Length (Packet Length, or Datagram Length) field is a 16-bit field in length that represents the total length of an IP packet and represents both data and headers. The minimum length is 21 bytes (default header length plus 1 byte of data). Since the field length is 16 bits, the maximum packet size is 2 ¹⁶ -1, that is, 65,535 bytes. (The length value for 0 cannot appear, so subtract 1.)

An identification field indicates an identification number assigned to an IP packet. Every IP packet is given an identification number when it is generated. The number is in a 16 bit field. IP packets are split into smaller "fragments" and sent to the destination, since each fragment belongs to the original IP packet and has the same unique number.

The flag field contains three flags:

reserved flag: always set to 0

don't fragment flag: Set to 0 to split the IP packet. If set to 1, no IP packets are split.

more fragments flag: If set to 0, it means that there are no more fragments. If set to 1, there are IP packets that are not yet received.

The fragment offset field indicates fragment related information. When the IP packet is fragmented, each paragraph has a value within a 13-bit field that represents the information of the original IP packet. For example, suppose an IP packet containing 128 bytes of data consists of two fragments, each containing 64 bytes of data. The fragment containing the preceding 64 data will have an offset of 0 because the data belongs to the original IP packet. Fragments containing trailing 64-byte data must indicate that they start after the preceding 64 bytes. Since the number of this field represents the number multiplied by 8 bytes, the fragment offset is 8 (8 * 8 = 64).

The TTL field indicates the duration of the IP packet. Each time an IP packet passes the router, the router decrements the TTL by one. So when TTL goes to zero, the packet is no longer sent. What is not transmitted so far is to think that it can not be transmitted. The original TTL value depends on the operating system. For FreeBSD, the default TTL is 64. Since this is an 8-bit field, the TTL can be up to 255 (2 ¹⁸ -1, since there can be no TTL for 0, so subtract 1).

The protocol field indicates protocol related information. This 8-bit value tells which IP packet contains the protocol's data and what type of information the packet's data area contains. Protocol number 1 indicates ICMP (Internet Control Message Protocol). This means that no data comes from the application in the IP packet. Instead, it contains some ICMP information. Protocol number 6 represents the TCP protocol. TCP is a transport control protocol. This IP packet has another header called the TCP header, which is located just after the IP header and before the beginning of the actual data being sent.

Protocol number 17 represents the UDP protocol, which is a connectionless transport. This IP packet has a UDP header, which is located immediately after the IP header and before the data being transmitted.

The header checksum field is a field for checking whether an IP packet is damaged. Each time an IP header is created or modified, the CRC (cyclic addition check) checks the bits in the IP header. Basically, a mathematical process (CRC algorithm) occurs that results in a checksum. When an IP packet is sent, the same CRC process is repeated in the header. If the result is the same (checksum), all bits in the IP header are sent correctly. If the result is different, some of the bits in the header have not been transmitted, which means that some of the IP packets were corrupted during transmission.

The Source Address field indicates the IP address of the host transmitting the IP packet.

The Destination Address field indicates the IP address of the host that receives the data contained in the IP packet.

The option and padding fields are optional fields for performing various functions in the IP packet. The only option in an IP packet is to provide a special transfer command that no other field in the IP header can. Additional instructions can be up to 40 bytes, but must be within a 32-bit word. If the instruction is not a 32-bit word, the remaining bits are filled with "padding" bits.

The data field is the last field of the IP packet and contains actual data. This is the actual data sent from one host to another. The data field begins with a Layer 4 header, which gives additional instructions to the application that will receive the data. Or it may be an ICMP header that does not contain any user information.

In order to provide QoS when transmitting medical data using an IP packet having such a field configuration, it is necessary to provide packet-identifiable information because the packets must be differentially serviced.

As shown in FIG. 3, a 1 Mbps voice application utilizes a 1.5 Mbps link between nodes R1 and R2 with an FTP application that transfers files from H2 to H4. When voice and FTP packets are mixed in the R1 queue, they are usually sent in FIFO mode. In this case, because the burst packets from the FTP can potentially fill the queue, voice packets may be delayed or lost due to overflow of the R1 queue. Since FTP applications have no time limit, voice packets should be given priority in R1. With this PQ scheduling scheme, voice packets will be sent preferentially over any FTP packets in R1. Therefore, the transport link from R1 to R2 can be used as a voice leased line of 1.5 Mbps. In order to distinguish between voice packets and FTP packets, each packet must provide information indicating a traffic class, which is called a packet classification. do.

4 shows only the TOS field in an IP packet. The IP packet may add priority.

The IP Priority feature specifies the Class of Service (CoS) class for each packet by using the 3-bit priority in the Type of Service (ToS) field of the IP header. The IP priority function assigns priorities based on IP addresses, media access control (MAC) addresses, physical ports, and applications by the application or access router.

An IP priority setting item that can be used in the ToS field is shown in FIG. 5. The IP priority bit settings 6 and 7 are used for network control information (routing update, etc.), and the other six are used for normal IP traffic flow. In general, however, all packets are classified as zero.

The IP priority feature allows the network to operate in passive mode, which accepts user-specified priorities, or in active mode, which sets or overrides priority assignments. IP priority may be related to related technologies (eg Tag Switching, Frame Relay, ATM, etc.) to provide a comprehensive QoS policy in different network environments.

Network administrators can define network policies for congestion processing and bandwidth allocation for each class using management policies that define six classes of service and access control lists (ACLs).

IP priority is a QoS mechanism that uses existing IP headers to set the class of service without the need for additional packet overhead and complex network signaling.

As such, if the transmission level of medical data is set using the ToS field of the IP packet for QoS, each IP network device can manage the scheduling required to transmit these IP packets so that the medical data can be transmitted by priority when transmitting the medical data. All.

In an IP network, packets are gathered in a queue to wait for transmission to a buffer on the transport link, and packets waiting in the queue are selected for transmission by a scheduling scheme. Therefore, this scheduling algorithm plays a very important role in providing QoS of IP network.

The FIFO (Firs In First Out) algorithm queues all incoming packets in one queue and, if bandwidth is available, sends them in the order in which they arrived. This approach generally has the advantage of being simple to implement but is not suitable for real-time applications. Therefore, PQ (Priority Queing), CQ (Custom Queing), and WFQ (Weighted Fair Queing) methods can be used for real-time applications.

6 is a diagram illustrating a PQ scheme in a traffic scheduling algorithm. Referring to FIG. 6, in the PQ scheme, packets arriving on a transport link are classified into one of several classes based on priority and wait in a corresponding queue. For example, the PQ scheme allows network administrators to set various traffic priorities (eg, high, normal, medium, low), and incoming traffic is assigned to one of several queues. In the PQ scheme, traffic in the high priority queue is processed until the queue is empty, and then packets of the priority are subsequently processed.

PQ method has the advantage that it can occupy enough bandwidth as the necessary data or traffic requiring real time processing is always needed. As a result, very low priority applications may not be allocated bandwidth and may wait forever. Therefore, when using the PQ scheme, priorities must be properly assigned so that applications do not lose the required bandwidth.

The PQ method is useful for dealing with real-time applications where doctors and patients in different spaces use a telephone call to conduct medical care using an Internet phone or an Internet video phone, and the highest priority traffic consumes the least bandwidth. It is preferable to use when.

On the other hand, the CQ scheme can assign a certain ratio of available bandwidth to a specific protocol. You can define up to 16 transmission queues, as well as additional queues for system messages (eg keepalives, etc.).

In addition, each queue is provided with a service in a round robin (RR) manner and transmits a portion of the traffic of the queue by the allocated bandwidth before moving on to the next queue. The router determines how many bytes should be sent in each queue based on the interface speed and the set traffic rate. Unused bandwidth can be used by other traffic until the queue needs maximum capacity. There is a problem that a network administrator needs to know the types and characteristics of traffic well, and there are many administrative overheads for managing the traffic.

7 is a diagram for explaining a WFQ scheme in a traffic scheduling algorithm. Referring to FIG. 7, the WFQ scheme classifies packets into various classes as in the PQ scheme, and the classification is not a service priority but a service type. In addition, the RR method processes each class in turn. The WFQ scheme shown in FIG. 7 is a general scheduling scheme of the RR scheme. It sorts the packets that arrive and assigns them to the appropriate queue, and then iterates by first processing class 1 by RR method, then class 2, then class 3. The difference between the WFQ schemes is that each queue serves a different amount by weight. For example, if a weight of Wi is assigned to class i, WFQ guarantees the service of W _i / ∑W _j of available bandwidth.

The WFQ approach prevents applications such as FTP from consuming a lot of bandwidth, preventing queues from running out of bandwidth and ensuring that traffic receives predictable services. That is, while a traffic volume with a small amount of traffic is preferentially processed to be transmitted quickly, the traffic volume with a large amount of traffic shares the remaining bandwidth capacity and divides or distributes the bandwidth equally.

WFQ can be serviced by any application because bandwidth is allocated equally among the flows. This concept is similar to the time division multiplexing (TDM) method. However, if there is no traffic stream, the WFQ uses bandwidth more effectively than the TDM scheme because it allocates to a flow that transmits the remaining bandwidth dynamically.

WFQ dynamically identifies a data stream or flow by several factors. The priority is dynamically set based on the amount of bandwidth consumed by the data flow. WFQ allows for fair sharing of bandwidth without special administration, and determines the flow using source and destination addresses, protocol type, socket or port number, QoS and ToS values.

WFQ allows low bandwidth applications to occupy as much bandwidth as needed and relatively bandwidth intensive traffic to share the remaining traffic fairly.

Jitter is reduced in WFQ and the available bandwidth can be shared among all applications. The weight of the current WFQ is affected by factors such as IP Priority, RSVP, IP RTP, RTP Reserve, Frame Relay Forward Explict Congestion Notification (FECN), and Backward Explict Congestion Notification (BECC).

The value of the IP priority field is between 0 (the default) and 7, and as the IP priority value increases, WFQ allocates more bandwidth to the conversation, making it possible to transmit quickly. The presence of congestion in a Frame Relay network is indicated by the FECN and BECN bits. In a congested state, the weight of the algorithm changes dynamically, and voice frames in congested state are transmitted slowly. Currently, WFQ is most widely used in routers because these weights can be used to differentially process the flow. However, the network administrator should give proper weight.

Therefore, medical data generated in each network device must be segmented into IP packets to be transmitted through the IP network. The IP header is added to the segmented medical data and transmitted over the network.

On the network, traffic header is analyzed according to the quality of service class label information of the IP packet by analyzing the IP header information included in each IP packet, and high class data is transmitted first according to the quality of service class label.

Although the preferred embodiments of the present invention have been described in detail above, it will be understood by those skilled in the art that the present invention may be modified or modified in various ways. Accordingly, modifications to the practice of the invention will not depart from the technical scope of the invention.

According to the present invention, when transmitting and receiving various medical data between medical devices connected through a network, the transmission priority is defined according to the characteristics of the data, and the data transmission processing is performed according to the transmission priority. When there are several medical data to be transmitted, the data with the highest transmission priority is processed in order, so that even if the data traffic is congested, data can be transmitted and received for medical data with high transmission priority and therefore urgent and reliable. Effectively support the quality of care provided.

Claims (10)

In the medical network system for transmitting medical data, Classifying a quality of service for determining transmission priority according to types of medical data; Setting a quality of service rating on any generated medical data; Generating a medical label header including information for indicating a quality of service level in a TOS field of an IP header when the medical data is to be transmitted through a network; And segmenting the medical data into a predetermined size, adding the generated medical header to generate a packet for transmission, and transmitting the medical data on a network. delete delete delete The method of claim 1, wherein the quality of service grade is classified according to a medical condition reflecting at least one item of medical data type, medical alert, medical treatment, and urgency. delete In the medical network system for transmitting medical data, Reading medical label header information included in the packet when the packet is introduced; Extracting a data transmission priority of a corresponding packet according to a quality of service from the extracted medical label header information; Transmitting medical data according to the extracted data transmission priority using a traffic scheduling algorithm; And When the network supporting the medical label is delivered to an external IP network that does not support the medical label, the gateway converts the medical label into a QoS protocol of MPLS (multi protocol label switching) and transmits the medical label. Medical data transfer method. delete The method of claim 7, wherein the quality of service grade is classified according to a medical condition reflecting at least one of a type of medical data, a medical alert, a medical treatment, and an urgency. delete

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