Method and system for verifying logical connection

• US 8,619,607 B2
• Filed: 12/17/2010
• Issued: 12/31/2013
• Est. Priority Date: 05/25/2007
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Hooper, Harold Scott, Olbricht, Eric Thomas
• Primary Examiner(s): PASIA, REDENTOR M
• Application Number:
  US12/928,771
• Publication Number:
  US 20110099279A1
• Time in Patent Office: 1,110 Days
• Field of Search: 370230-235, 370236-2362, 370248-249, 370252-253, 370449-450, 370/457, 370/477, 709/203, 709/222, 709225-229, 709/237, 380227-278, 380/283, 726 3- 4
• US Class Current: 370/252
• CPC Class Codes: H04L 43/0811 by checking connectivity
• CPC Class Codes: H04L 43/10 Active monitoring, e.g. heartbeat, ping or trace-route
• CPC Class Codes: H04L 43/16 Threshold monitoring
• CPC Class Codes: H04L 43/50 Testing arrangements

Abstract

A method and system for maintaining a high reliability logical connection between hosts employs adaptive transparent pinging, clone blocking and bandwidth leveling to realize improvements in the areas of connection status verification, security and bandwidth management. In adaptive transparent pinging, a ping interval that defines a frequency at which ping messages are transmitted from an initiating host to a receiving host to check connection status is dynamically regulated based on data indicative of the reliability of a connection. In clone blocking, the receiving host verifies that a new connection that appears redundant is a re-established connection from the initiating host rather than a cloned connection. In bandwidth leveling, data bursts pending on initiating hosts that exceed a predetermined size are scheduled for transmission to receiving hosts.

Claims

1. A communication system comprising:

an initiator; and

a recipient communicatively coupled with the initiator,

wherein the initiator generates and transmits, to the recipient, a message carrying a random session number, wherein the initiator and the recipient apply a common scheme to independently generate, on the initiator and the recipient, a common current session number based on the random session number, wherein the initiator transmits, to the recipient, on a second logical connection, the common current session number generated on the initiator, wherein the recipient compares for a match the common current session number generated on the initiator with the common current session number generated on the recipient, and wherein the recipient drops a first logical connection in favor of the second logical connection in response to the match.

2. The communication system of claim 1, wherein, upon finding the match, the recipient transmits, to the initiator, an acknowledgement message including the common current session number.

3. The communication system of claim 1, wherein the initiator transmits the random session number in the first message transmitted after establishment of the first logical connection, and the initiator transmits the common current session number generated on the initiator in the first message transmitted after establishment of the second logical connection.

4. The communication system of claim 1, wherein the common scheme generates common current session numbers by one of modifying common previous session numbers in accordance with a common algebraic or geometric progression, performing common bitwise logical operations on common previous session numbers or performing common table lookups on common previous session numbers.

5. The communication system of claim 1, wherein, at a ping interval, the initiator transmits, to the recipient, ping messages, and for an acknowledgement interval the initiator receives, from the recipient, acknowledgement messages responsive to the ping messages, and wherein the initiator dynamically adjusts the ping interval based on a count of transmitted ping messages and received acknowledgement messages.

6. The communication system of claim 1, wherein the initiator transmits, to the recipient, on a logical connection, a data burst transmission request including a burst size, and wherein the recipient transmits, to the initiator, in response to the data burst transmission request, a data burst transmission grant including a transmission profile.

7. The communication system of claim 6, wherein the transmission profile includes a current time, a transmit time, a peak rate and a transmission key.

8. A method for verifying a logical connection, comprising:

receiving, by a recipient from an initiator, a random session number;

receiving, by the recipient from the initiator, on a second logical connection, a common current session number generated on the initiator based on the random session number and a common scheme;

independently generating, on the recipient, the common current session number based on the random session number and the common scheme;

comparing for a match, on the recipient, the common current session number generated on the initiator with the common current session number generated on the recipient; and

dropping, by the recipient, a first logical connection in favor of the second logical connection in response to the match.

9. In a communication system having an initiator and a recipient coupled over a communication network, the recipient, comprising:

a processor; and

a memory associated with the processor, wherein the recipient is configured to receive, from the initiator, a random session number, receive, from the initiator, on a second logical connection, a common current session number generated on the initiator based on the random session number and a common scheme, independently generate, under control of the processor, the common current session number based on the random session number and the common scheme, compare for a match, under control of the processor, the common current session number generated on the initiator with the common current session number generated on the recipient and drop, under control of the processor, a first logical connection in favor of the second logical connection in response to the match.