Wireless broadcast protocol

• US 7,475,322 B2
• Filed: 09/23/2004
• Issued: 01/06/2009
• Est. Priority Date: 11/14/2003
• Status: Expired due to Fees

• Current Assignee: Avocent Huntsville, LLC (Vertiv Holdings Co.)
• Original Assignee: Avocent Huntsville Corporation (Vertiv Holdings Co.)
• Inventors: Moore, Richard L., Covington, C. David, Lally, Charles, Huntly-Playle, Iain, Li, Sheng
• Primary Examiner(s): Torres; Joseph D
• Application Number:
  US10/947,164
• Publication Number:
  US 20050108614A1
• Time in Patent Office: 1,566 Days
• Field of Search: 714748-751
• US Class Current: 714/748
• CPC Class Codes: G06F 11/1443 Transmit or communication errors

Abstract

In a keyboard-video-mouse (“KVM”) system in which a target computer may be wirelessly accessed by a plurality of remote stations, a method includes, by the target computer: obtaining a frame of video data; transmitting packets for the frame; transmitting a query packet; obtaining a list of requests from at least one of the remote stations, each request from a particular remote station identifying packets missed by that particular remote station; and resending at least some of the requested packets.

Claims

1. In a keyboard-video-mouse (“

KVM”

) system in which a target computer may be wirelessly accessed by a plurality of remote stations, a method comprising, by the target computer;

(A) obtaining a frame of video data;

(B) transmitting packets for the frame;

(C) transmitting a query packet requesting at least some of said plurality of remote stations to provide a list of packets that need to be resent;

(D) obtaining from each of at least two of the remote stations, a list of one or more packets that need to be resent, wherein the list of packets from a particular remote station identifies packets missed by that particular remote station;

(E) removing duplicates from the lists of packets that need to be resent; and

then

(F) resending at least some of the requested packets.

2. A method as in claim 1 further comprising:

repeating (A) through (B) while there is more video data.

3. A method as in claim 1 further comprising:

sorting the lists of packets that need to be resent prior to removing duplicates.

4. In a keyboard-video-mouse (“

KVM”

) system in which a target computer may be wirelessly accessed by a plurality of remote stations, a method comprising, by the target computer;

(A) obtaining a frame of video data;

(B) transmitting packets for the frame;

(C) transmitting a query packet requesting at least some of said plurality of remote stations to provide a list of packets that need to be resent;

(D) obtaining from each of at least two of the remote stations, a list of one or more packets that need to be resent, wherein the list of packets from a particular remote station identifies packets missed by that particular remote station;

(E) sorting received lists of packets and removing duplicates from the lists of packets that need to be resent;

(F) resending at least some of the requested packets; and

repeating (A) through (F) while there is more video data.

5. A device, in a keyboard-video-mouse (“

KVM”

) system in which a target computer may be wirelessly accessed by a plurality of remote stations, the device comprising;

(A) a mechanism constructed and adapted to obtain a frame of video data;

(B) a mechanism constructed and adapted to transmit packets for the frame;

(C) a mechanism constructed and adapted to transmit a query packet, said query packet requesting at least some of said plurality of remote stations to provide a list of packets that need to be resent;

(D) a mechanism constructed and adapted to obtain from each of at least two of the remote stations, a list of one or more packets that need to be resent, wherein the list of packets from a particular remote station identifies packets missed by that particular remote station;

(E) a mechanism constructed and adapted to remove duplicates from the lists of packets that need to be resent; and

(F) a mechanism constructed and adapted to resend at least some of the requested packets.

6. A method as in claim 5 further comprising:

a mechanism constructed and adapted to sort the lists of packets that need to be resent prior to removing duplicates.