TWI224915B - System and method for managing flow bandwidth utilization in a packet communication environment - Google Patents

Abstract

To manage the bandwidth of a network, a novel rate control scheme, time-division-queue rate control scheme (TDQ-RCS), is provided. The TDQ-RCS according to the present invention can rapidly determine departure time of an arrival packet, add the arrival packet into the time division queue to which it belongs according to the departure time, and then output the packet on schedule. All algorithms employed by the TDQ-RCS can be completed in a constant time since these algorithms are simple for the arrival packets of different sizes. Especially, the TDQ-RCS neither generates any dummy packet nor wastes any bandwidth but still can accomplish the bandwidth management. Therefore, the present invention significantly accomplishes the bandwidth management of a network without generating any dummy packet and wasting the bandwidth.

Description

A7 Description of Invention (1 Field of the Invention The present invention relates to digital packet telecommunications, and more specifically, to a system and method for managing process bandwidth utilization in a packet communication environment. BACKGROUND OF THE INVENTION In a network environment, When the flow of data flow on the network increases, the frustration and width of the network are not important issues. In the technology of network bandwidth management, the person skilled in the technology can usually use policies defined by users in advance. Mainly, QoS rules control the bandwidth of each traffic flow. In fact, network bandwidth management has several advantages, such as the protection of the maximum allowed traffic flow and the reduction of end-to-end routing congestion. To achieve bandwidth management, several traditional technology methods have been proposed to have generalized processor sharing (Gps) properties (for more details, the "field descriptions" refer to Appendix 2, 6, and i 3). These technologies are ㈣ (Weight Fair Queuing) ^ WF2Q (Worst-case-Fair Weighted Fair Queuing), etc. (For more detailed explanation, please refer to the appendix, 3, 4 and 12) As usual, these traditional institutions are focused on weighted official calculations of bandwidth law, And the research community pays more attention to algorithms. In addition, WFQ has been proposed by the Internet Engineering Task Force (IETF) organization to have a basic building block for future integrated service networks. However, these technologies are so complex that they are not cost-effective Implemented in high-speed network devices (for more details, please refer to appendixes 3 and 5). In addition, they cannot achieve user-friendly control methods for rate-limiting control. ^ To decide on the above problems, in some existing In network equipment, an active transmission rate control method can be adopted in the bandwidth management device (for more detailed description, please refer to the appendix 7, 8, 9, 10). In this active transmission rate control Η

Binding

Line-4-This paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 mm) 1224915 A7 _______ B7__ V. Description of the invention (2) In the method, the control message can control the status according to the latest rate of each traffic flow And each endpoint of the network is actively transmitted, so that the transmission rate of all endpoints can be actively slowed down or accelerated based on the transmitted control message. However, the active transmission rate control method generates many control messages, and from the viewpoint of network utilization, these control messages are essentially various virtual packets. Therefore, the active transmission rate control method still wastes the available bandwidth of many networks, even if this method can control the flow rate of each traffic well. SUMMARY OF THE INVENTION To solve the above-mentioned flow control of the network, the present invention can provide a new transmission rate control method, which is one of the time series rate technology (TDQ-RCS). The TDQ-RCS according to the present invention can quickly determine the departure time of an arriving packet, add this arriving packet to its scheduled queue according to its departure time, and then output the packet according to a predetermined time. Moreover, since these algorithms are simple for arriving packets of different sizes, all the algorithms adopted by this TDQ-RCS can be completed in a fixed time. In particular, TDQ-RCS does not generate any virtual packets or waste any bandwidth, but still achieves bandwidth management. Therefore, by using creative TDQ-RCS, the present invention can easily obtain the following benefits: (1) network resource management; (2) two-way bandwidth management; (3) application / service / client / mobile station bandwidth guarantee (4) traffic flow control without generating any virtual packets; and (5) friendly transmission rate limitation of the QoS control method. Therefore, the advantages of the present invention can provide the method and device for managing the bandwidth of the data communication network based on the tdq_rcs according to the present invention, without generating the paper size suitable financial @ S 家 料 -5- A7 B7 Description of the invention (3 Any virtual packet and waste of bandwidth. Another advantage of the present invention is to provide an unbalanced bi-directional TCP stream and I-stream transmission based on the present invention based on TDQ-RCS using the maximum segment large J (MSS) header. One method and device of data communication network bandwidth without generating any virtual packets and wasting bandwidth. The simplicity and clarity of the drawings and other aspects and advantages of the invention will become apparent from the following description taken with the accompanying drawings, of which: FIG. 1 is a simplified block diagram showing an ideal timing queue control method (TDQ-RCS) according to a specific embodiment of the present invention; FIG. 2 (a) is an input packet showing the ideal TDQ-RCS of FIG. 1 Flow chart; FIG. 2 (b) is a flowchart showing a schedule indicator of the ideal TDQ-RCS of FIG. 1; FIG. 3 is a simplified diagram showing an approximate ideal TDQ-RCS according to another embodiment of the present invention; Figure 4 (a) shows the approximate principle of Figure 3. Think of an input packet flow of tdq_rcs_, Figure 4 (b) is a flow chart showing a schedule indicator of the approximately ideal tdq-RCS of Figure 3. Figure 5 (a) is a MSS pattern shown in a SYN segment 5 (b) is a flowchart showing an approximate TDQ-RCS with mss. Detailed description of the preferred embodiments The present invention will now be described more clearly with reference to the drawings showing specific embodiments of the present invention. Although, One of the specific embodiments described is related to a complementary metal oxide semiconductor (CMOS) image sensor application, but is well-known in the art. 6- This paper standard is applicable to the Chinese National Standard (CNS) A4 specification (21〇 x297 mm) 1224915

Description of the invention U called the skilled person to understand that the present invention can meet her in many different forms published here. These specific examples can be provided, so this disclosure will be thoroughly related to King 70, and the scope of the present invention can be fully conveyed to those skilled in the art. Preferred embodiments of the invention shown in the drawings will now be described in more detail, wherein like reference numerals designate similar or opposite elements in all figures. Bandwidth Management Based on QOS rules based on pre-defined policies, the bandwidth management device used in the network according to the present invention can control, for example, the bandwidth of each incoming traffic flow of the bandwidth management device of the QoS router. The bandwidth management method according to the embodiment of the present invention is a so-called TDQ-RCS. The method of the present invention can quickly determine the packet departure time of a network device, and transmit the bandwidth of a QOS router, for example, by adding a arriving packet to its corresponding schedule based on its departure time. Manage the device's arrival packets. And 'All algorithms of this method can be completed in a fixed time. The more important TDQ RCS will not generate any virtual packets or waste any bandwidth, but it can still complete the bandwidth management of the bandwidth management device. Therefore, by using TDQ-RCS, we can easily obtain the following benefits: (1) network resource management, (2) two-way bandwidth management, (3) guaranteed bandwidth of applications / services / customers / sites, and (4 ) Does not generate any control flow of virtual packets. m 伫 Rate control brake ^ To simplify the processing of TDQ-RCS, it is like the currently available bandwidth management system ’Rate control can always use the knowledge of the quality of service (Q〇s) information of the input packet

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’A packet rate control module on the Ϊwide management device starts to output’ D, processing m ’related Q os information is always attached to the input packet. As known to those skilled in the art, a traffic classification module (not shown in the figure) can be provided on the input terminal of the bandwidth management device. The traffic classification module can confirm the traffic information of the incoming packets flowing into the bandwidth management device, such as the maximum packet rate, the minimum packet rate, and the commission rate. In addition, several packet rate control f can be established by the amount classification model. The _information of the input packet can be obtained directly or indirectly from the traffic information. Details of the traffic classification module can be found in the Republic of China (Taiwan) Patent Case No. 88121943 and its corresponding US Patent Case No. 09 / 498,096. In addition, in order to simplify the analysis of the bandwidth management problem, the present invention first deals only with unidirectional traffic flows processed in TDQ-RCS. Then, the present invention can: By applying two sets of TDQ-RCS to control the flow of traffic in two different directions, the processing can be optimized, so that two-way bandwidth management can be achieved. To implement the TDQ-RCS of the present invention, the time domain can be divided into an infinite number of time slots. Each time slot is a fixed interval and contains a queue where the queue can store information about packets that must be transmitted on this time slot on a schedule.

Ideal TDO-RC ^ S Figure 1 shows the structure of an ideal TDQ-RCS according to the present invention. First, it is defined in TDQ-RCS for the sake of simple analysis. The time domain 3 is divided into a fixed number of time slots 31, for example, 1 microsecond, and a memory 2 of the bandwidth management device 1 contains the corresponding queue 21. A plurality of memory cells 2 丨. Each of the four rows 21 corresponds to each time slot, so it is called a time series (tDq) 2}. Each TDQ 21 can have information about incoming packets 10, where the incoming packets are packed

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AT invention description (6) Bandwidth management device on the corresponding time slot of the schedule. In fact, when implementing TDQ-RCS, 'it is not easy to have infinite time slots unless memory 2 is very large. So' the following will be Discuss near-ideal TDQ-RCS. In addition, in order to improve the processing of TDQ-RCS in TCP traffic flow mode, set the maximum fragment size (MSS) [Ref. 12 for details in the Appendix] can be applied to TDQ-RCS. Fig. 2 (a), the input packet 10 includes an input packet including the packet content and the related q0s Besson, which is a rate evaluator 12 input to the bandwidth management device 1 via a channel 11. The rate evaluator The 12 Q's of a QOS measurement module (not shown in the figure) can then be determined based on the QoS information of the input packet 10 (step 21) to determine how to handle the input packet 10. When a # excessive rate packet 13 is executed ( (Right branch of FIG. 2 (a)), if the packet rate of the input packet 10 does not exceed the legal rate predetermined by the traffic classification module of the input packet 10, the rate evaluator 2 can directly transmit the bandwidth management device 1 Input packet 10 (step 22). Input packet 10 pre-footed The normal rate can be established in the traffic rules of the traffic classification module. Otherwise, the 'rate evaluator 12 can use an input packet 10 of the excessive rate packet 14 and based on the QoS information of the excessive rate packet 14 according to the following equation (丨) and (Step 23) Calculate the time slot that the overrate packet 14 should be designated. POT = CST + PQT... ⑴ (2) where: the current system time (CST) represents the current time of the bandwidth management device 1; Packet Queue Time (PQT) means the time that tdQ-RCS queues the input packet 10 should be determined by the QoS measurement module used for packet rate control; -9-this paper & degree pass / Π 中 ㈣ 家 料 ( CNS) A4 size ㈣χ 297 public goods)

Pretend

Line invention description (7 packet departure time (ροτ) indicates the time that the input packet 10 should be transmitted; time slot interval size (TSIS) indicates the interval size of each time slot; and time slot ID (TSID) indicates that the input packet 10 belongs to After that, the rate evaluator 12 can allocate the overrate packet 14 (step 24) and attach it to the timed queue 21 for calculating the time slot (step 25). As shown in FIG. 1, a schedule instruction The symbol 22 is provided in the memory 2 to indicate which time slot is the input packet 10 should be sent out. Please refer to FIG. 2 (b), the schedule means that the symbol 22 can periodically perform the next time slot in the time domain, and The period is an interval equal to time slot 31, so that the time slot of the schedule indicator 22 can always be synchronized with the system time of the bandwidth management device 1. The schedule indicator 22 can act as the following equation (3) (step 26) TSID = PTSID + 1 ...... (3) where: PTS ID (early time slot ID) indicates the number of the most recently scheduled time slot; and TSID (previous time slot) Time slot ID) indicates the number of the last scheduled time slot. When the time slot of the schedule indicator 2 2 is performed with a non-blank line Zone queue, the bandwidth management device 1 will send all the packets arranged in the time slot queue. In this way, the input packet 10 can be scheduled to be transmitted from the bandwidth management device 1. Figures 2 (a) and 2 (b ) Shows the input packet 10 and schedule indicator 22 of the ideal TDQ-RCS respectively. As shown in equations (1) to (3), all parameters are calculated with the size and input number of the input packet 10 (ie, this Where the process comes from) has nothing to do with, all algorithms of the ideal TDQ-RCS can be completed in a fixed time, and the ideal TDQ-RCS can control any unidirectional traffic flow rate very well. However, when implementing -10- this paper standard Applicable to China National Standard (CNS) A4 specification (210X 297 mm) 5. Description of the invention (8) When ideal TDQ-RCS cannot be implemented with unlimited time slots. Therefore, an approximate value of ideal TDQ-RCS will be described below. Therefore, the ideal TDQ- FIG. 3 shows the structure of an approximately ideal TDQ-RCs according to the present invention, in which “time loop” 30 can be used to effectively simulate the function of infinite time slots as shown in FIG. 丨 time. The ring 30 is composed of a limited number of time slot strings 32, and each time The slot string 32 is also a time interval, and is equal to the time slot interval. As shown in Figure ㈣, the 'slot string 32 contains-or more time. When the slot string 31 is implemented in the memory 2, the same All time slots 31 in time material 32 can always be sorted in one-scene order based on their relative time slot IDs. Each time slot contains-timed queue, and an input packet can be based on its Q0s information The time-lapse sequence stored in a time slot is shown in FIG. 4 (a), which shows a flowchart similar to the TDQ-RCS input packet 10. All incoming packets 10 containing the packet content and related QoS information are still first entered into the rate evaluator 12, and the rate evaluator 12 will decide how to process the incoming packets 1 based on the QOS information of the incoming packet 10 (step 41). . If the input packet 10 does not exceed its legal rate, the rate evaluator 12 will forward it directly (step 42). Otherwise, the rate evaluator 12 may calculate the time slot to which the input packet belongs based on the QoS information of the input packet 10 according to equations (1) to (3) (step 43). ": After that, the rate evaluator 12 may further calculate the time slot string (TSCID) to which the calculated time slot (tsid) belongs (step 44). If the calculated time slot string (TSCID) packet is input, the packet 10 belongs to ( The time slot ip) of the step (left branch of step α), the rate evaluator 12 can directly allocate the input packet 10 (step 46) and add it to the time series queue of calculating the time slot string (step 47). Otherwise, the rate The evaluator 丨 2 can be inserted in the calculation of -11-this paper size applies the Chinese National Standard (CNS) Ad specification (21 × 297 mm) 1224915 AT B7 V. Description of the invention (9 time slot string (TSCID) a new time Slots, and hold all time slots in one-litre order based on their IDs (step 48). The rate evaluator 12 may then assign the input packet to the new slot in the calculation time slot string Column 2 (step 47). Equations (4), (5), and (6) are the calculations of the time slots and time series shown in the rate evaluator 12. POT = CST + PQT ..... r / 1x (5) (6) TSCID = TSID mod TRS where: CST (head system time) represents the current time of the bandwidth management device; PQT (packet queue time) Indicates that the time of the input packet should be approximated by the TDQ-RCS queue for rate control; PQT (packet departure time) indicates that the time of the input packet should be transmitted from the bandwidth management device 1; tsis (time slot interval size) is Indicates the interval size of each time slot 31; TSID (time slot ID) indicates the number of time slots to which the input packet 10 belongs; TRS (time loop size) indicates the number of time slot strings in the time loop, and TSCIDC time slot string id) indicates the number of timeslot strings to which the timeslot belongs. For approximate TDQ-RCS, the schedule indicator 22 is also used in the time circle 30. The schedule indicator 22 can be performed periodically around the time circle 30. The next time slot is the same, and the period is the interval of the material gap string 32. Please refer to FIG. 4 (b). When the scheduling indicator 22 performs a new time slot string, the system time of the bandwidth management device ( (Step 51), & and can be used to calculate which of the new time slot-12-1224915 A7 B7

V. Description of the invention (1Q time slot should be processed at this time (step 52). In this way, the schedule indicator 22 can always be synchronized with the system time. Similarly, the actions and time slot calculations are performed as in equation (7) and (8). After calculating the time slot, the schedule indicator 22 will check whether the first time slot ID in this time slot string is equal to the calculation time slot D. If it is affirmative, queue up in this time slot All packets arranged in the sequence will be sent out (step 53), and this time slot can be further removed (step 54). Therefore, the packet can be transmitted on time by using this method. Regarding the implementation of the arrangement of input packets and approximate TDQ-RCS Process indicator processing flow, please refer to Figure 4 (a) and 4 (〇OSTSCID = (POSTSCID + 1) mod TRS. 0STSID = CST tsIs ⑺⑻ where TRS (time loop size) is the number of time slot strings in the time loop ; P0STSCID (previously scheduled slot string ID) indicates the number of the last scheduled slot string; 0STSCID (scheduled slot string id) indicates the number of scheduled slot strings; CST (current system time) indicates the current status of the system Time; TSIS (time slot interval size) means each time The interval size and OSTSID (scheduled slot ID) are the number of scheduled slots. A The calculation based on the above algorithm of approximately ideal TDQ-RCS is time-consuming. That is, the input packet is allocated to Before time slot 31, the rate evaluator 12 must find the time slot belonging to the input packet 10 in the calculation time slot string. In fact, this search is not easy to complete in a fixed time. However, in the network environment -13- x 297 mm) This paper size applies the Chinese National Standard (CNS) A4 specification (210 1224915 A7 invention description (11 features). A transmission traffic flow from any transmitter will be restricted. In fact, if the time loop The size of 30 is selected large enough. The number of time slots 31 in any time slot string 32 will be limited to a small number range, and the search can be substantially completed in a fixed time. Based on the above, all algorithms of approximately ideal TDq-RCS can A reasonable fixed time to complete, and the approximate TDQ-RCS can function in real time, and since these algorithms are simple for input packets of different sizes, it can control any unidirectional flow with approximately ideal TDQ-RCS Flow rate.

The approximate TDQ-RCS of the maximum segment size is as described above. TDQ-RCS can control the flow rate of any unidirectional traffic very well. A simple way to achieve bidirectional bandwidth management is to use two sets of TDQ-RCS in the bandwidth management device 1. However, in order to deal with Transmission Control Protocol (TCP) traffic flows, TDQ-RCS must be raised to include the expiration of π time for TCP traffic flows, and π characteristics must be confirmed with π. To help understand the two characteristic effects of the TDQ-RCS of the present invention, the following situations can be considered: (1) When the legal rate of a TCP stream is very low, and a larger-sized packet passes the TCP traffic stream When transmitting from a terminal on the network, the larger size packet will be listed by the bandwidth management device 1 for a longer period of time, so that it will inevitably cause an expiration of TCP time. In this case, a larger-sized packet must be retransmitted by the terminal. (2) When two traffic flows of very different rates are retained in the same TCP connection in two different directions (for example, the rate in one direction is very low and the rate in the other direction is very high), and the packet size transmitted in both directions Are essentially the same. For example, by receiving -14 data packets from endpoint 2 in the high-speed direction, the paper size applies the Chinese National Standard (CMS) A4 specification (210 X 297 mm) A7 B7 V. Description of the invention (12)% Point 1 (see Figure 5a), the confirmation signal transmitted in the low-rate direction will always be queued by the bandwidth management device 1 for a long time. TCP has a special flow control mechanism. That is, 'Before transmitting the next_continuous packet, the transmitter must ^ f acknowledge the previous transmission packet from the receiver. Therefore, since the transmitter waits for an acknowledgement signal to be transmitted in a low rate direction, it will be queued by the bandwidth management device for a long time, so an ideal rate cannot be achieved in a very high rate direction. -In order to solve the above situation, according to a preferred embodiment of the present invention, the queue time of a packet from a low-rate direction transmitter can be reduced without changing the original QoS information. According to the present invention, based on the QoS information, if the payload size of a packet is greater than the legal rate predetermined for the traffic flow, a packet transmitted through the transmitter at a low rate direction can be divided into a series of comparative packets. To achieve this division, an optional title for the maximum fragment size (milk s) of TCp can be used in the present invention. MSS is the maximum payload size set for TCP traffic flow. Therefore, the packets transmitted in the low-speed direction through the transmitter can be divided into a series of smaller packets by modifying the MSS of the TCP. As is known to those skilled in the art, when a TCP connection is initially established between two ends of a computer network, the MSS option will only appear in one SYN segment (SYN). Figure 5 (a) shows the method used to modify the mss appearing in the syn segment. Refer to Figure 5 (a). When the endpoint ί wants to send / receive data packets between endpoints 2, an initial synchronization process will be performed between the two ends of the SYN segment. &Quot; " " The MSSi system with 1 SYNi in ^ indicates the maximum payload size of the packet, and endpoint 丨 is received from endpoint 2; and the MSS2 series with SYN2 from endpoint 2 indicates the maximum payload size of the packet, and Endpoint 2 is -15- This paper is a standard gg * standard (CNS) M specification (Norse X 297 public love) 1224915 A7 B7 V. Description of the invention (13)

Received from endpoint 1. As shown in FIG. 5 (a), the bandwidth management device 1 according to the present invention is located between a network 1 (such as a LAN) connected to the endpoint 1 and a network 2 (such as a WAN) connected to the endpoint 2. Connection. When receiving SYNi and SYN2, the rate evaluator 12 of the bandwidth management device 1 can determine whether the packet MSS from the endpoint 1 will cause the above two situations; further, whether the packet MSS2 from the endpoint 2 will cause the above two situations . Fig. 5 (b) is a flowchart showing an approximate TDQ-RCS input packet 10 with MSS. From these two figures, we can clearly see that the bandwidth management method of the approximate TDQ-RCS with MSS can determine the MSS values at both ends according to their relative rates, and if necessary, modify the initial MSS value. In addition, if the MSS has been modified, the checksum total TCP header must be recalculated in the correction section. In this way, either end will not transmit a packet with a payload size larger than its MSS in TCP processing. As mentioned above, the basic concepts of TDQ-RCS have been explained, and a specific embodiment for implementing TDQ-RCS in the real world has been provided, and a specific embodiment of TDQ-RCS can be optimized by modifying the MSS. According to the present invention, the following objectives can be easily achieved:

(1) Network resource management; (2) Two-way bandwidth management; (3) Bandwidth guarantees for applications / services / customers / mobile stations; and (4) Control the traffic flow that does not generate any virtual packets. Although the present invention is disclosed from the viewpoint of a preferred embodiment, it is not limited to the present invention. The present invention can still be modified or changed by a person skilled in the art without departing from the scope and spirit of the present invention determined by the following application patents. -16- This paper size is in accordance with China National Standard (CNS) A4 (210 X 297 mm) 1224915 A7 B7 V. Description of the Invention (M) Appendix * Reference [1] In September 1989, by A. Demers, S. Keshav, and S. Shenker, published in SIGCOMM Symposium on communications Architectures and Protocols, "Analysis and S i mu 1 at i on of a Fair Queuing Algorithm". [2] In June 1 993, the name nA Generalized Processor Sharing Approach to ACM / IEEE Transactions on Networking, Book 1, No. 3, pages 344-357, by A. Parekh and R. G. Gallager Flow Control-The Single Node Case ". [3] In June 1999, the names published by DC Stephens, JCR Bennett, and H. Zhang in IEEE Journal on Selected Areas in Communications, Volume 17, Number 06, pages 1145-1158 '' Implementing Scheduling Algorithms in High-Speed Networks " ° [4] In March 1996, the name published by JCR Bennett and H. Zhang in Proc · IEEE INFOCOM'96. NWF2Q: Worst -case Fair Weighted Fair Queuing " o [5] In April 1996, the name published by J.C.R. Bennett and H. Zhang in NOSDAV'96 " Why WFQ Is Not Good Enough for Integrated Services Networks " o [6] in 1994 The name 'published by Yaron and M. Sidi in the Journal of High Speed Networks on pages 375-387 " Generalized Processor Sharing Networks with -17- This paper size applies to China National Standard (CNS) A4 specifications ( 210X297 mm) 1224915 A7 B7 V. Description of the invention (15)

Exponentially Bounded Burstiness Arrivals [7] U.S. Patent No. 6, 038, 216 issued by Pack eteer, Inc. on March 14, 2000 1'Method for Explicit Data Rate Control in a Packet Communication Environment without Data Rate Supervision 丨 丨. [8] On September 1, 1998, US Patent No. 5, 802, 106 issued by Packeteer, Inc. " Method for Rapid Data Rate Detect ion in a Packet Communication Environment without Data Rate Supervision " o [9] On January 25, 2000, US Patent No. 6,018, 516 issued by Packeteer, Inc. Name " Method for Minimizing Unneeded Retransmission of Packets in a Packet Communication Environment Supporting Plurality of Data Link Rates & quot o [10] U.S. Patent No. 6,046,980, published by Packeteer, Inc. on April 4, 2000 " System for Manage Flow Bandwidth Utilization at Network, Transport and Application Layers in Store and Forward Network. [11] "TCP / IP Illustrated Volume I-The Protocols" by W. Richard Stevens. [12] In March 2000, the name "1 ^ 11113" (^ Fair Queuing: Fair Bandwidth Sharing Without Per-Flow State ", published by Z. Cao, Z. Wang and E. Zegura in INFOCOi / T 00. [13] In August 1994, by ZL Zhang, D. Towsley and J. -18- This paper size applies Chinese National Standard (CNS) A4 (210 x 297 mm) binding

1224915 A7 B7 V. Explanation of the invention (16) 1 ^ 111'〇36? 1: 〇 (:. 八 〇 ^ 1316 (: (^^ 1/94, pages 68-77, published under the name 'Statistical Analysis of Generalized Processor Sharing Scheduling Discipl ine 丨 丨. -19- This paper is scaled to China National Standard (CNS) A4 Specification (210X297 Public Love)

Claims (1)

A8 B8 C8 D8 Patent Application Scope · A method for controlling an input packet in a bandwidth management device used in a data communication network to manage any traffic flow rate corresponding to the input packets, the bandwidth management device It has a memory, which contains a plurality of units as time-lapse queues. Each queue corresponds to a fixed interval time slot in the time domain. The method includes the following steps: (a) fetching from the input packet Return the quality of service (QoS) information of the traffic stream; (b) determine whether the transmission rate of the input packet exceeds a legal rate predetermined by the traffic stream based on the QoS information; (C) if the transmission rate of the input packet Exceeding the predetermined legal rate, allocating the input packet to a time-line queue; and (d) transmitting from the bandwidth management device when the corresponding time of the time-line queue is equal to the system time of the bandwidth management device As soon as the input packet is listed in the row. 2. If the method of claiming the patent scope item 丨, this step (the magic system further includes the following steps: (cl) if the transmission rate of the input packet exceeds the predetermined legal rate, based on the Q0s information of the input packet The time slot to which the input packet belongs is determined, where the determined time slot is the corresponding step ((0). 3. If the method of item 2 of the patent application is applied, wherein the plurality of time slots are A time loop with a period (time loop size TRS) is continuously configured. The time loop is composed of a fixed number of time slot strings, and each time slot string contains one or more time slots. This step (.) Further includes the following steps: (Please read the notes on the back before-_ this page), 1T printed by the Consumer Consumption Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs-20 'Shan 4915 A8 B8 C8 D8 Patent Application The range (c2) determines the time slot string to which the determined time slot belongs. Please read the 5 notes before (c3) if the 'determined_ string contains the time slot to which the input packet belongs' append the input packet. By the time of that decision Schedule of the gap in the expected queue; and (⑷ If the determined time slot string does not include the time slot to which the input packet belongs' add-new time slot to the determined time slot string, and the input The packet is appended to the scheduled time slot of the determined time slot in the decisive time slot string. 4. If the method of patent application is applied, the method includes the following steps: After step (b), if the input The transmission rate of the packet does not exceed the predetermined legal transmission rate, and then the input packet of the bandwidth / device is directly transmitted. Order 5.-A bandwidth management device used in a data communication network, the bandwidth management device includes:- A flow classification module is used to determine the input packet from the input packet (⑽ information; and based on the QoS information; = rate does not exceed the predetermined legal rate of the traffic flow; printed by the Shell Standard Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs) The installed T memory contains a plurality of individual queues that are regarded as time-lapse queues corresponding to a fixed-interval time slot in the time domain; = Evaluator 'If the transmission rate of the input packet exceeds the predetermined speaking rate, Used to distribute the input packet Queue the time zone, ... The time corresponding to the time zone schedule is equal to the system of the bandwidth management device: At two o'clock, the input packet is transmitted from the bandwidth management device to the zone. TJ ^ Table applicable (CNS -21-Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs ¾ Patent Application Scope 6. If the bandwidth management device of the patent application scope item 5 is used, the transmission rate of the second package exceeds the predetermined legal rate, this: evaluation = Yu Enter the packet. Β soil time, step, and time to enter the queue to which the packet belongs. This is the plan corresponding to step 7. 7 Such as the patent application No. 5 of the sleeping bed, Yami e-device, where The plurals are configured with a period of time e, j Cheng Yang%, and the child time loop is composed of a plurality of fixed time intervals, and each time slot. 4 timeslots' and where the rate evaluator can determine the :::: slot string to which it belongs; if the determined slot string contains: the slot to which it belongs, append the input packet to the The time slot of the decision time slot in the time slot string is determined; if the determined time slot does not include the time slot to which the input packet belongs, a new time slot is added to the determined time slot string and the input packet is The time slot of the decision time slot added to the decision time slot string. 8. If the bandwidth management device of item 5 of the patent application scope, if the transmission rate of the input packet does not exceed the predetermined legal rate, the rate evaluator can directly transmit the input packet of the bandwidth management device. 9. A method for controlling a two-way traffic flow rate between any two terminals on the data communication network in a bandwidth management device used in the data communication network, the bandwidth management device having a memory including As a plurality of time-lapse queues, each queue corresponds to a fixed-interval time slot in a time domain. The method includes the following steps: (a) during the time when the two terminals start to establish a connection, Detect-22- This paper Magic 1 (Chinese National Kneading Standard (CNS) M threat (210X297mm) '~ ----- (Please read the precautions on the back before filling out this page)., 11 ^ 4915 A8 B8 C8 A. Patent application scope SYN segment; (b) retrieve the maximum segment size (MSS) option header transmitted between the two terminals among the synchronization segments, wherein the MSS option header transmitted from a terminal is designated from The payload of the input packet at another terminal; (C) retrieving quality of service (QoS) information from the input packet; (d) if the bandwidth determined by the MSS header causes the bandwidth management device to fail to control the The two-way traffic flow rate. Modifying the Mss option header transmitted from a terminal based on the transmission rate contained in the QoS information of the terminal, so that the maximum payload of the input packet can be reduced; and if the MSS option header has been changed Modified, the mss option header can be used to recalculate a checksum of a TCP header of the input packet; (e) determine whether the transmission rate of the input packet exceeds a predetermined one of the input packets based on the q0s information Legal rate, regardless of whether the payload is reduced; (o If the transmission rate of the input packet exceeds the predetermined legal rate, assign the input packet to a row And (g) when the corresponding time of the schedule is equal to the time spent on the bandwidth management device ’s Central Consumers ’Bureau of the Ministry of Economic Affairs ’s consumer cooperative to print the $ L system time, the queue transmitted from the bandwidth management device is listed in the schedule 10. The method of item 9 in the scope of patent application, wherein step (e) further includes the following steps: (e 1) If the transmission rate of the input packet exceeds the predetermined legal rate 'may Based on the QOS information of the input packet, the input packet is determined. -23- This paper size applies to the Chinese national kneading rate (0 milk) 戌 4 rules / grid (210 fathers 297 public holidays) 6. Time slots for patent application scope The time sequence of the decision. · The schedule corresponding to step (f) 11. If the scope of the patent application is the 10th item ^ Ώ ^ 10,000, where the multiple timeslot counties have a cycle (TRS) time loop φ = Μ 嗦 疋 continuous configuration in time, the time σ is composed of a fixed interval of a plurality of time slot j j 疋 嗦 series, and each time slot contains one or more Time slot, and not by step "el" The further sentence includes the following steps: g (e2) determines the time slot string to which the decision time slot belongs; (e3) if the data slot string contains the time slot to which the input packet belongs, appends the input packet to the input (E4) If the time slot string is not included in the determined time slot string, the new time slot string will be -new_added The determined time slot string, and the input packet is added to the time-scheduled list of the determined time slot. 12. If the method of the scope of patent application No. 9 further includes: after step (e), if the The input packet does not exceed the predetermined legal rate, and the input packet of the bandwidth management device is directly transmitted. -twenty four-