[특허]Method and apparatus for dynamic adjustment of cable modem back-off parameters in a cable modem network

[미국특허] Method and apparatus for dynamic adjustment of cable modem back-off parameters in a cable modem network 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-012/28 H04L-012/56 H04N-007/173
출원번호	US-0234774 (1999-01-20)
발명자 / 주소	Gummalla, Ajay Khaunte, Sunil
출원인 / 주소	Cisco Technology, Inc.
대리인 / 주소	Beyer Weaver & Thomas LLP
인용정보	피인용 횟수 : 62 인용 특허 : 15

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A technique is provided for dynamically adjusting modem back-off parameters in a cable modem network. The technique is based on the theoretical result that the ratio of the number of the successful band width requests (Ns) to the number of collisions (Nc) has a value (e-31) when the back-off values are correctly estimated. The present technique for dynamically adjusting modem back-off parameters utilizes this concept to correspondingly correct the back-off parameters, depending upon the value of the Nc/Ns ratio, so as to cause this ratio to converge to the desired ratio of Nc/Ns equal to approximately 0.7. If the ratio of Nc/Ns is greater than a first specified value, the back-off start and backoff-end parameters (broadcast by the CMTS to cable modems on the downstream channel) are increased. If the ratio of Nc/Ns is less than a second specified value, the back-off start and backoff-end parameters are decreased. The present technique provides for improved access delay and improved throughput performance in contention sub-channels of cable access networks, particularly those involving large round trip delays. Additionally, the technique of the present invention utilizes elementary CPU operations, making it a viable and cost-efficient solution which is easily implemented and allows for rapid execution in existing cable modem network systems. Furthermore, the technique of the present invention is able to track the number of contending cable modems in a network over a much larger range than previous techniques. apparatus of claim 16, wherein the header comprises a Logical Link Control/SubNetwork Attachment Point (LLC/SNAP) header. 18. The apparatus of claim 9, wherein the in-band signaling logic is operably coupled to receive an in-band signal including a Virtual Private Network identifier identifying a Virtual Private Network to be added to the connection. 19. The apparatus of claim 9, wherein the in-band signaling logic is operably coupled to receive an in-band signal including a Virtual Private Network identifier identifying a Virtual Private Network to be removed from the connection. 20. The apparatus of claim 9, wherein the multiplexing logic is operably coupled to receive the packets over the connection and determine a Virtual Private Network for each packet. 21. The apparatus of claim 20, wherein the multiplexing logic is operably coupled to determine the Virtual Private Network for each packet based upon inherent information within each packet. 22. The apparatus of claim 20, wherein the multiplexing logic is operably coupled to determine the Virtual Private Network for each packet based upon a Virtual Private Network identifier encoded in each packet. 23. The apparatus of claim 22, further comprising a database mapping each of a plurality of tags to a corresponding Virtual Private Network identifier. 24. The apparatus of claim 23, wherein each packet includes a tag, and wherein the multiplexing logic is operably coupled to retrieve the Virtual Private Network identifier from the database based upon the tag. 25. The apparatus of claim 22, wherein each packet includes a Virtual Private Network identifier, and wherein the multiplexing logic is operably coupled to extract the Virtual Private Network identifier from the packet. 26. The apparatus of claim 25, wherein the Virtual Private Network identifier is included in a header within each packet. 27. The apparatus of claim 26, wherein the header comprises a Logical Link Control/SubNetwork Attachment Point (LLC/SNAP) header. 28. A computer program product comprising a computer readable medium having embodied therein a computer program for supporting multiple Virtual Private Networks in a Multi-Protocol Over ATM/Next Hop Resolution Protocol (MPOA/NHRP) communication system, the computer program comprising: connection establishment logic programmed to establish a connection over the MPOA/NHRP communication system; in-band signaling logic programmed to use in-band signals to designate the connection for a number of Virtual Private Netw

이 특허에 인용된 특허 (15) 인용/피인용 타임라인 분석

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[미국특허] Method and apparatus for dynamic adjustment of cable modem back-off parameters in a cable modem network 원문보기

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[미국특허] Method and apparatus for dynamic adjustment of cable modem back-off parameters in a cable modem network 원문보기

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