Method and system for discarding and regenerating acknowledgment packets in ADSL communications

A technology for acknowledging grouping and information regeneration, which is used in transmission systems, telephone communications, digital transmission systems, etc.

Inactive Publication Date: 2003-05-28
ECE TELECOM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method and system for discarding and regenerating acknowledgment packets in ADSL communications
  • Method and system for discarding and regenerating acknowledgment packets in ADSL communications
  • Method and system for discarding and regenerating acknowledgment packets in ADSL communications

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[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0024]Forward throughput using TCP for unidirectional transmission follows the AMP model, where A is the ACK transmission rate, M is the multiplier (packets generated for each received ACK), and P is the ACK packet size. That is, due to the joint effect of TCP dynamics and ACK rule schemes, and the average packet size is P bits / sec, the part of the reverse link allocated to ACK traffic is saturated with A ACK / sec, and each ACK generates M groups (M=multiplier). If the forward link capacity allocated to the packets corresponding to these ACKs is F bits / sec, then the forward link throughput during the observation period is limited to Min(F, A x M x P) bits / sec. Since the ACK rate A is constant, the only variables are M and the packet size P.

[0025] As discussed earlier, Lakshman's standard bandwidth rate "K" is characterized by an absolute upper bound on forward throughput based on link bandwidth and the ratio of pack...

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Abstract

A method and system for discarding and regenerating transmission control protocol (TCP) acknowledgment packets (ACKs) transmitted over an asymmetrical digital subscriber line (ADSL) to increase the data transmission rate. When an incoming ACK is received at a first intermediate node located at one end of the ADSL link, the intermediate node determines whether a prior ACK from the same connection/flow (TCP receiver) is presently stored in a queue awaiting transmission. If a prior ACK packet is not presently stored in the queue, the incoming ACK packet is stored in the queue. However, if there is a prior ACK packet in the queue, the information contained in the incoming ACK packet is stored in a per-connection state table and the incoming ACK packet is discarded. When the prior ACK packet is ready to be transmitted to a second intermediate node via the ADSL link, the information contained in the per-connection state table regarding the discarded incoming ACK is copied into the prior ACK. Upon receiving the prior ACK, the second intermediate node regenerates the discarded ACK based on the information contained in the prior ACK.

Description

field of invention [0001] The present invention relates to a method and system for transferring data packets over an asymmetric digital subscriber line. More particularly, the present invention relates to a method and system for discarding and regenerating Transmission Control Protocol (TCP) acknowledgment packets during delivery over an Asymmetric Digital Subscriber Line (ADSL) to increase data transmission rates. Background of the invention [0002] The invention of Data Subscriber Line (DSL) technology is used as a transmission medium for Integrated Digital Network (ISDN) basic rate access channels. Asymmetric DSL (ADSL) provides various Internet access rates over a single twisted pair. Therefore, ADSL has the highest potential in the DSL family and will provide inexpensive broadband access to homes and offices in the near future. Currently, the primary application of ADSL in Internet services is to bear the weight of TCP. TCP occupies a high proportion of Internet tra...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/16H04L12/56H04L29/06H04L29/08H04M11/06
CPCH04L2001/0092H04L29/06095H04L29/08027H04L29/06149H04L69/163H04L47/10H04L69/168H04L1/1635H04L1/1854H04L29/06H04M11/062H04L29/06115H04L69/16H04L69/324H04L9/40
Inventor K·基达比
Owner ECE TELECOM LTD
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