Wireless broadcast protocol

• US 20050108614A1
• Filed: 09/23/2004
• Published: 05/19/2005
• Est. Priority Date: 11/14/2003
• Status: Active Grant

• Current Assignee: Avocent Huntsville, LLC (Vertiv Holdings Co.)
• Original Assignee: Avocent Huntsville Corporation (Vertiv Holdings Co.)
• Inventors: Li, Sheng, Moore, Richard L., Covington, C. David, Lally, Charles, Huntly-Playle, Iain
• Granted Patent: US 7,475,322 B2
• Time in Patent Office: Days
• US Class Current: 714/776
• 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;

(D) 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

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

2. A method as in claim 1 further comprising:

removing duplicates from the lists of requests prior to the resending.

3. A method as in claim 1 further comprising:

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

4. A method as in claim 2 further comprising:

sorting the lists of requests prior to removing duplicates.

6. A method as in any of claims 1-5 wherein the target computer is selected from the list comprising:

a server, a desktop computer, a kiosk, an ATM, a switch, a set-top box, an appliance, a vehicle, an elevator, a processor in a manufacturing or processing production line.

5. 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;

(D) 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;

(E) sorting received lists and removing duplicates from the lists;

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

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

7. 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 a remote station;

receiving from a target computer packets representing video data;

keeping a list of missed packets;

upon receipt of a query packet from the target computer, send to the target computer at least some entries from the list of missed packets; and

receiving at least some resent packets from the target computer.

8. A method as in claim 7 wherein the list has no more than eight entries.

9. 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;

(D) a mechanism constructed and adapted to obtain 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

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

10. A device as in claim 9, further comprising:

a mechanism constructed and adapted to remove duplicates from the lists of requests prior to the resending.

11. A method as in claim 10 further comprising:

a mechanism constructed and adapted to sort the lists of requests prior to removing duplicates.