KR20000054473A - Device and Protocol for Multimedia Traffic Processing and Fair-Share Bandwidth Allocation in Ethernet LAN - Google Patents

Abstract

PURPOSE: A device for processing multimedia traffics and for assigning equivalent bands in an Ethernet LAN, is provided to equally divide realtime services and LAN traffics based on Quality Of Service(QoS), and control traffics by distributing a transmitting volume to hosts in LAN. CONSTITUTION: In a device for processing multimedia traffics and for assigning equivalent bands in Ethernet LAN, a host requests signaling to a LAN gate for a Round-Robin(RR) mode service. A driver of an Ethernet device signals to the LAN gate using a frame format. A normal Ethernet frame receives/transmits data of the RR mode service. The LAN gate receives a connection setting release from the host and a frame type generated in the driver of the Ethernet service, broadcasting transition of the RR mode using frame types, generating a frame type at the last point of alpha, to notify start of a mode of Carrier Sense Multiple Access/Collision Detection(CSMA/CD) to the host. The LAN gate notifies start and exit for a RR mode of transmitting admission to the host using frame types. Connected hosts receive a time interval under the RR mode, to execute operations. A transmission time interval for the host increases according to a requested transmission ratio, when the host is connected to RR mode services.

Description

Device and Protocol for Multimedia Traffic Processing and Fair-Share Bandwidth Allocation in Ethernet LAN

The technical field of the present invention is the field of LAN equipment and protocol development that can implement a fair distribution of real-time servicie and LAN traffic. More specifically, it provides IP voice and video services in Ethernet and Intranet environments, and develops QoS based LAN equipment and protocols to realize fair distribution of traffic in residential LAN environments such as APT. LAN transmission technology of the existing field does not implement a special guarantee for the real-time service. In addition, because all hosts have the same access rights, other subscribers can be damaged by a particular subscriber in the residential LAN environment. Currently, the Internet (including Intranet) is required to develop in a form that can guarantee real-time service. Recently developed routers include functions that can handle real-time services, but in existing Ethernet environment and router, QoS of real-time service is not guaranteed by classification of traffic type. In addition, there is a need for a method for satisfying user service needs by appropriate traffic distribution in residential (APT) LAN environments.

The present invention adds a simple interface and a new hardware when the real-time service is not provided in the Ethernet environment and the Intranet, and when a fair distribution of traffic is required in the LAN, while maintaining the structure and system of the existing Ethernet network as it is. How to add QoS function. LANgate is the name of a hardware device, and a description of its function and the operation of the software is included in the present invention. It also includes a software module that can handle real-time service and traffic distribution on the host's LAN card. In addition, a traffic management manager for processing QoS parameters required by the application software of the host is present in each host. In the present invention, the CSMA / CD protocol, which is an existing Ethernet MAC protocol, is basically used as it is, but a part of the RR is modified Develop a device (using LANgate) that can handle mode service separately. To this end, the host needs a technology that works with this device. First of all, the protocol and frame format needed to communicate with LANgate in LAN card should be defined. In addition, there is a need for a method for informing the QoS of a given service in an application program. Of course, LANgate must be able to understand the new frame type or protocol, and also have the function to implement the function corresponding to such protocol or frame format. For traffic going to the Internet, LANgate also needs the ability to define the Internet packet type. In Intranet, LANgate processes the frame type in the form defined in the present invention.

1 is a conceptual description as to the parameters and the relationship between them for distinguishing a round-robin (RR) mode service and a CSMA / CD mode service in LANgate. Fig. 2 shows the functions handled by the LANgate, and the LANgate process instructs or responds to the items requested for processing by the backgrond process. Figure 3 shows processes that enable communication with a LANgate in an Ethernet device driver. 4 shows a function of processing signaling and transmission separately for traffic for which RR mode service is requested in software of a host. 5 is a new Ethernet frame format required for signaling in order to establish a connection in the RR mode service, and is generated by the Ethernet device driver when requested by the service software of the host. FIG. 6 is a new Ethernet frame format required for signaling in order to release connection in RR mode service, and is generated by the Ethernet device driver when requested by the service software of the host. 7 is a broadcasting frame format for notifying CSMA mode start in an RR mode service, and is generated by a LANgate. 8 is a broadcasting frame format for informing the CSMA mode end in an RR mode service, and is generated by a LANgate. 9 is a frame format for informing the frame rate to hosts participating in the service in the RR mode, and is generated by the LANgate. FIG. 10 is a frame format for indicating the end of a transmission order to hosts participating in a service in an RR mode, and is generated by a LANgate.

<Description of Round-Robin and CSMA / CD mode>

The RR mode is the mode that handles the traffic by allocating a certain time interval to each host in LANgate. The time interval initially maintains only the minimum time interval for signaling, and when the host requesting the RR mode service is accepted, the time interval allocated to the host increases as requested. In addition, a minimum time interval to indicate the start and end of the CSMA / CD mode is also used in the RR mode. The operations performed in the RR mode from FIG. 1 are as follows. (1) The host requests the LANgate for signaling for the RR mode service. At this time, the Ethernet device driver signals the LANgate using the FIG. 5 frame format. 5 (a) means that the frame is a signaling frame, and (b) means a frame for requesting connection establishment. (C) is used to distinguish a traffic type. (D) indicates the requested service rate. (E) and (f) are IP address and port number. (2) Data transmission / reception of RR mode service uses existing Ethernet frame. (3) Connection establishment release is sent from host to LANgate, and Ethernet device driver generates Figure 6 frame type and sends it to LANgate. It is similar to the frame type of FIG. 5 and is only distinguished from the connection establishment case using FIG. 6 (b). (4) Broadcasting for RR mode transition occurs in LANgate and uses frame type of FIG. 7 and FIG. Referring to FIG. 1, the RR mode operates during α in each period T. After the RR mode is executed for each host, LANgate generates the frame type of FIG. 7 at the end of α to inform all hosts of the start of the CSMA / CD mode. 7A is a filed indicating a CSMA / CD and follows the CSMA Start field (B). Likewise, when the CSMA / CD mode for T − α is finished and the RR mode is started, LANgate generates the frame of FIG. 8 to notify all hosts of the termination of the CSMA / CD mode. At this time, the case of start is distinguished using FIG. (5) The LANgate notifies the host of the start and end of the transmission permission by the round-robin method using the frame types of FIGS. 9 and 10. In RR mode, all of the connected hosts are given a fixed time interval (determined by the total number of hosts connected to the LAN) to perform the above enumeration. At this time, if the host requesting the RR mode service is allowed to access the service, the transmission time interval for the host is increased by the requested transmission rate. The transmission rate according to the order is informed about the host performing each RR mode service (using FIG. 9 frame format) and also the end of the order (using FIG. 10 frame format). In the frame type of FIG. 9, (a) indicates that the RR mode is in operation. (B) indicates the status of transmission. (C) informs the corresponding baud rate for the host. (D) and (e) are the IP address and port number of the transmitting host, respectively. In the frame type of FIG. 10, only (b) in FIG. 9 is changed. Paragraph (b) tells the host to wait for the next sequence.

<LANgate function>

Scheduling Process performs the following functions. (1) Receive a request from hosts requesting RR mode service. The frame format used at this time is shown in FIG. (2) For the requested RR mode service, LANgate determines the access permission and then completes the Scheduling Table of FIG. Send an OK signal to the host. (3) It handles all cases of RR mode service and provides interval to operate as CSMA / CD mode to hosts who want CSMA / CD mode service. (4) In FIG. 1, the time for performing the RR mode service is determined by α. T is the maximum time period value to be determined in LANgate, and is determined using the maximum number of hosts belonging to the LAN, the link status, and the number of currently active hosts. The functions of the incoming and outgoing frame processes are as follows. (1) In the case of traffic destined for the Internet, the frame type part defined internally is removed and sent (Figs. 5 to 10). In this case, all traffic is handled in CSMA / CD mode. (2) The frame structure of traffic destined for the intranet uses the frame types shown in Figs. (3) Process RR mode service frames first through Buffer management. The buffers for RR and CSMA / CD traffic are kept different. (4) It performs transmission scheduling for each traffic type according to the scheduling table set up during signaling. (5) Traffic coming from the Internet is handled in CSMA / CD mode. (6) Traffic flowing from intranet distinguishes real-time and non-real-time services, which are classified first through signaling.

<Ethernet Card>

The following functions are performed on the Ethernet card. (1) Wait for a command from LANgate to operate by CSMA / CD. The end of the CSMA / CD operating mode is also received from LANgate. (2) RR mode processing Data is processed in a round-robin manner, so if the host receives its own transmission order and transfer amount from LANgate, the device driver processes it. (3) Separate buffers for RR mode and CDMA / CD mode service and signaling traffic. (4) A frame can be created by processing parameters passed from the TMM.

<Host mode RR mode service processing S / W>

It is a S / W in Host and performs the following functions. (1) Maintain a traffic management manager (TMM) to handle RR mode services. (2) Indicate application information generated through TMM to Ethernet driver in application S / W that generates real-time video, audio and voice.

1. In LAN and Intranet environments that support existing best-effort services

It can provide real time service.

2. It can implement traffic control based on distribution of traffic to hosts in LAN environment. Used to build a local area LAN environment.

3. In all cases above, the service can be provided considering QoS.

4. Differential charging by service provider by service differential.

Claims (4)

Mixed use of CSMA / CD and Round Robin in LANgate. Mixed use of CSMA / CD and Round Robin implemented in Ethernet driver. Signaling method in LAN and intranet environment using traffic management manager when RR mode service is required. Ethernet frame format to perform the above method.