System and method for data transfer acceleration in a TCP network environment

• US 20020078164A1
• Filed: 12/13/2000
• Published: 06/20/2002
• Est. Priority Date: 12/13/2000
• Status: Abandoned Application

• Current Assignee: Marnetics Limited
• Original Assignee: Marnetics Limited
• Inventors: Reinschmidt, Menachem
• Application Number:
  US09/734,921
• Publication Number:
  US 20020078164A1
• Time in Patent Office: Days
• US Class Current: 709/217
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/1835 Buffer management
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks
• CPC Class Codes: H04L 43/0864 Round trip delays
• CPC Class Codes: H04L 43/0888 Throughput
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/163 In-band adaptation of TCP data exchange; In-band control procedures
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A system and method for increasing the efficiency of broadband information channels using an optimization engine that monitors, measures and controls actual data throughput in TCP networks. The optimization engine is implemented as a single sided proxy server, receiving, sending and controlling all data traffic in the network. The engine defines and monitors the TCP session capacity for individual channels, and generates responses to accelerate data flow speed, in existing access pipes. The engine generates and sends out fake acknowledgement messages to an information source, and influences data flow speed and accuracy by controlling the quantity, frequency and content of these messages. Furthermore the present invention enables maximizing the receive window size of clients by combining the available buffer capacity of multiple clients into shared memory space, and allocating usage of this space according to real time statistical calculations. The engine also checks the data received by clients for lost packets, and when discovered, initiates a fast recovery mechanism that includes sending of multiple duplicate fake acknowledgement messages to a relevant server.

Claims

1. A system for optimizing data transfer at any point in time in a TCP network, comprising:

i. TCP network for transferring data between at least two computer devices;

ii. client for accessing Internet using said TCP network;

iii. server for transferring content over said TCP network; and

iv. proxy server for receiving and forwarding all data sent between servers and clients in a network, thereby emulating a server towards a client, and emulating a client towards a server in said TCP network.

2. The system of claim 1, wherein said proxy server incorporates an optimization engine for tracking and controlling data throughput in a TCP network from within said proxy server.

3. The system of claim 1, wherein said proxy server is positioned between any server and client, and controls all data and messages transferred between said server and said client.

4. The system of claim 1, wherein said proxy server is positioned within any server or within any client, and controls all data and messages transferred between said server and said client.

5. The system of claim 2, wherein said proxy server is single sided, stationed only at the server side.

6. The system of claim 2, wherein said proxy server is single sided, stationed only at the client side.

7. The system of claim 2, wherein said optimization engine uses a Scalable TCP/IP Connectivity (STIC) algorithm to monitor data flow in said TCP network.

8. The system of claim 7, wherein said scalable TCP/IP connectivity (STIC) algorithm is further used to track, analyze and control data flow in said TCP network

9. The system of claim 2, wherein said optimizer monitors, traces and controls bi-directional data flow between two or more parties.

10. The system of claim 2, wherein said optimization engine monitors real time session capacity of TCP sessions.

11. The system of claim 2, wherein said optimization engine is operative to forward packets unchanged, modify packets, generate new packets and discard packets.

12. The system of claim 2, wherein said optimization engine monitors and traces the overall available bandwidth in a TCP network.

14. The method of claim 13, wherein said tracing session capacity trends is achieved according to the following steps:

i. maintaining a record of previous Round Trip Time; and

ii. formulating trends and estimating session condition based on said previous Round Trip Time.

15. The method of claim 13, wherein said execution of responses includes manipulating the frequency of said fake acknowledgement messages.

16. The method of claim 13, wherein said execution of responses includes manipulating the content of said fake acknowledgement messages.

17. The method of claim 15, wherein said execution of responses further comprises emulating an infinite client by combining the receive buffers of multiple clients into a shared common memory.

18. The method of claim 17, wherein said emulating an infinite client further comprises controlling receive window size of client in said fake acknowledgement messages.

19. The method of claim 17, wherein said emulating an infinite client further comprises allocating on dynamic basis a large amount of shared memory buffers in a proxy server for a group of sessions, enabling those sessions to increase their receiving capacity.

20. The method of claim 13, further comprising monitoring session responses to said data transfer manipulation in order to provide real time feedback for said trends tracing.

21. The method of claim 13, wherein the method for increasing the efficiency of data transfer in a TCP network, further comprises the steps of:

i. identifying situations of packets not received by mechanisms selected from the group consisting of clients and servers;

ii. activating a fast retransmission mechanism (multiple duplicate acknowledgment messages) to recover said lost packets; and

iii. sending a fake acknowledgement message that acknowledges said lost packet and all the other consequent data packets that were correctly received.

13. A method for increasing efficiency of data transfer in a TCP network, comprising the steps of:

i. identifying and tracing currently active TCP sessions on a per session basis;

ii. measuring current session capacity for individual active sessions.

iii. tracing session capacity trends; and

iv. generating fake acknowledgement messages to remotely manipulate server behavior, according to the current session capacity.

22. A method for determining session capacity at any given time in a TCP network, comprising:

i. Identifying individual active sessions;

ii. Generating fake acknowledgement messages based on real acknowledgement messages received from a client;

iii. Sending said fake acknowledgement messages to a server; and

iv. Analyzing individual session data transfer rates based on RTT (Round Trip Time) trends.