Source: http://www.google.de/patents/US5634006?hl=de
Timestamp: 2013-05-20 18:53:09
Document Index: 763521362

Matched Legal Cases: ['art 1', 'art 1', 'art 3', 'art 3', 'art 4', 'art 4', 'art 4', 'art 4']

Patent US5634006 - System and method for ensuring QOS in a token ring network utilizing an ... - Google PatenteSuche Bilder Maps Play YouTube News Gmail Drive Mehr » Erweiterte Patentsuche | Webprotokoll | Anmelden Erweiterte Patentsuche PatenteA data processing system for regulating access to a communication network is disclosed herein. The data processing system employs a component that can be implemented in hardware logic or software. The component regulates access to the priority queue or transmit channel that is attached to the shared...http://www.google.de/patents/US5634006?utm_source=gb-gplus-sharePatent US5634006 - System and method for ensuring QOS in a token ring network utilizing an access regulator at each node for allocating frame size for plural transmitting applications based upon negotiated information and priority in the network Ver�ffentlichungsnummerUS5634006 APublikationstypErteilung Anmeldenummer08/540,923 Ver�ffentlichungsdatum27. Mai 1997Eingetragen11. Okt. 1995 Priorit�tsdatum17. Aug. 1992Auch ver�ffentlicht unterEP0583965A2EP0583965A3EP0583965B1 ErfinderMark J. BaugherJohn K. BiglerMark R. SimpsonUrspr�nglich Bevollm�chtigterInternational Business Machines Corporation US-Klassifikation709/228370/455709/224370/229Internationale KlassifikationH04L29/06G06F13/00H04L12/433H04L29/08H04L12/56 UnternehmensklassifikationH04L2012/5632H04L12/433H04L2012/5645H04L2012/5636H04L47/36H04L47/10H04L29/08045H04L29/06H04L29/06537H04L47/13H04L47/20 Europ�ische KlassifikationH04L47/20H04L47/13H04L47/10H04L47/36H04L12/433H04L29/06ReferenzenPatentzitate (21)Nichtpatentzitate (28) Referenziert von (77)Externe LinksUSPTO USPTO-Zuordnung EspacenetSystem and method for ensuring QOS in a token ring network utilizing an access regulator at each node for allocating frame size for plural transmitting applications based upon negotiated information and priority in the networkUS 5634006 A Zusammenfassung A data processing system for regulating access to a communication network is disclosed herein. The data processing system employs a component that can be implemented in hardware logic or software. The component regulates access to the priority queue or transmit channel that is attached to the shared medium local area network section. All access to the priority queue or transmit channel must pass through this component, thus subjecting all communication transactions to rejection or tracking by the component. The component allocates a frame size based on the information to be transmitted and the priority to assure the transmission will be completed in line with the quality of service required. The component monitors the rate and size of messages to assure that an application's actual throughput does not exceed its negotiated throughput. The component, moreover, is capable of operating in correction mode where throughput and frame size violations are prevented and reported. Alternatively, the component operates in detection mode where violations are recorded and reported to an application.
Having thus described our invention, what we claim as new, and desire to secure by Letters Patent is: 1. An apparatus for transmitting information through a network of interconnected computers, comprising: (a) means for storing network information in each one of said interconnected computers indicative of the quality of service required for a plurality of transmitting applications within said computers, including a priority for information to be transmitted in a token ring protocol; and (b) means, connected to said means for storing, for allocating a frame size for each one of said interconnected computers for said plurality of transmitting applications based on the information negotiated by a transport medium and said network of interconnected computers and the priority in said token ring protocol.
8. A method for transmitting information through a network of interconnected computers, comprising the steps of: (a) storing network information in each one of said interconnected computers in a vectoring component indicative of the quality of service required for a plurality of transmitting applications within said computers, including a priority for information to be transmitted in a token ring protocol; and (b) allocating a frame size for each one of said interconnected computers for said plurality of transmitting applications in said vectoring component based on the information negotiated by a transport medium and said network of interconnected computers and the priority in said token ring protocol.
15. A method of monitoring the rate and size of communication transactions of a network, said network including a plurality of workstations connected thereto, comprising: providing within each of said plurality of workstations a single access regulator having a vectoring component attached to said network; receiving by said access regulator a communication transaction from a plurality of transmitting applications to be directed to one of said plurality of workstations on said network; dynamically allocating a frame size in said vectoring component based on the communication transaction from said plurality of transmitting applications and a priority of a selected one of said workstations corresponding to a quality of assurance value negotiated by said access regulator and said one of said selected workstations; and monitoring the communication transactions of said network by said access regulator and comparing the communication transaction of said selected one of said workstations with said quality of assurance value negotiated by said one of said selected workstations.
Among the key features of the invention is a bandwidth Management Information Base (MIB). The MIB contains throughput and delay objects that are read (GET) or written to (SET) by one or more stations. The delay MIB object is based on the number of stations on the ring currently sending priority frames (determined statically through configuration or dynamically using a systems management MIB object called current.sub.-- number.sub.-- of.sub.-- priority.sub.-- stations), and a MIB object named maximum.sub.-- frame.sub.-- size.
The station's bandwidth manager component initializes a routing control (RC) field of Medium Access Control (MAC) frames to maximum.sub.-- frame.sub.-- size. Since this field is employed by other components, such as bridges, to constrain the maximum frame size, the bandwidth manager will only change the AC to a lower value, as opposed to a higher value, prior to passing a frame to a MAC application. Upon receiving a frame, zero priority or non-zero priority, the bandwidth manager checks to see if its length exceeds maximum.sub.-- frame.sub.-- size. If it does, the bandwidth manager interrogates another MIB object correction.sub.-- mode; if correction.sub.-- mode is set to one, the frame will be rejected, the sending process notified, and the MIB object maximum.sub.-- frame.sub.-- size.sub.-- exceeded is incremented by one; if correction.sub.-- mode is not set to one, then the frame will be transmitted normally after maximum.sub.-- frame.sub.-- size.sub.-- exceeded is incremented. The user may optionally apply a threshold value to any counter, such as the maximum.sub.-- frame.sub.-- size.sub.-- exceeded counter, and be notified when the counter exceeds a threshold value.
FIG. 5 is a block diagram of OSI system management. Management of bandwidth on a shared transmission medium, such as the IBM Token Ring, can be considered as a systems management function. The layer of interest is OSI layer 2 500, called the "Link Layer" in OSI parlance and the MAC, or medium access control layer by the IEEE. The Management Information Base of interest includes a throughput object for each user of the MAC, this object's name is "negotiated.sub.-- rate" and a second throughput object for each MAC user called "actual.sub.-- rate". Similarly, there is a time interval object called time.sub.-- interval, and there is a last time the clock was read for each application called last.sub.-- time. Access to the system clock is also assumed, though the system clock is not part of the MIB. Other objects that can be included in the MIB are correction.sub.-- mode, maximum.sub.-- priority.sub.-- frame.sub.-- size, maximum.sub.-- frame.sub.-- size as well as rate.sub.-- exceeded, and frame.sub.-- size.sub.-- exceeded counters.
FIG. 8 is a flow chart that specifies the logic of the "Vectoring and Bandwidth Management" component showed in FIG. 7. The component receives transmission frames as shown in input block 800, checks the length of all frames as depicted in decision block 810, increments a MIB object count when the length exceeds the maximum as shown in decision block 812 and output block 814, and optionally rejects the frame when the length exceeds the maximum.sub.-- frame.sub.-- size MIB object as shown in decision block 810. Also shown in the flow of FIG. 8, priority frames are metered to ensure that the sending application, a protocol product such as NetBIOS, is not incorrectly exceeding its negotiated rate of flow as shown in decision block 830. The "protocol.sub.-- id" field of NDIS is used for associating a particular MIB with a particular application. A simple metering algorithm is used to ensure that a particular application is within its negotiated rate, and this ensures that the QOS of other applications in the workstation or in other workstations on the ring will not be "robbed" of bandwidth by a poorly behaved or erroneous process. In the present embodiment, the negotiated rate is taken to be a maximum, but a negotiated.sub.-- average.sub.-- rate can also be used. In every case, the MIB objects of a particular application are undefined until that application registers with NDIS and obtains a protocol.sub.-- id. When this occurs, the MIB object counters are set to zero as is the throughput count as shown in function block 842.
Delay statistics are determined based on the maximum.sub.-- frame.sub.-- size MIB object (there may be maximum.sub.-- data.sub.-- frame.sub.-- size for non-priority traffic and maximum.sub.-- priority.sub.-- frame.sub.-- size for the priority traffic). Also configured or maintained dynamically is the data.sub.-- station.sub.-- count and priority.sub.-- station.sub.-- count which, together with the maximum frame sizes, can be employed to estimate worst case delay.
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