Method and system to abort data communication traffic in a communication network

• US 6,434,165 B1
• Filed: 08/19/1998
• Issued: 08/13/2002
• Est. Priority Date: 08/19/1998
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: 3Com Corporation (HP Inc.)
• Inventors: Sherer, Paul, Araujo, Kenneth, Wang, Peter Si-Sheng
• Primary Examiner(s): Ton, Dang
• Application Number:
  US09/136,795
• Time in Patent Office: 1,455 Days
• Field of Search: 370/465, 370/464, 370/474, 370/503, 370/401, 370/389, 370/410, 370/246, 370/447, 370/450, 370/461, 370/462, 370/438, 370/431, 370/384, 370/397, 370/252, 370/254, 370/409, 714/758, 714/746, 714/756, 714/754, 714/752, 714/747, 714/751, 714/759, 714/760, 714/761, 714/762, 714/764, 714/768
• US Class Current: 370/465
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/31 by tagging of packets, e.g. using discard eligibility [DE] bits
• CPC Class Codes: H04L 47/32 by discarding or delaying data units, e.g. packets or frames

Abstract

A communications network system that transmits and receives communication frames that include a transmission status section that indicates a communication frame transmission is aborted. In one embodiment, a transmission status section includes a cyclical redundancy check value that is non-matching with the information in the communication frame. For example, a non-matching cyclical redundancy check value is created by generating a one'"'"'s compliment of a CRC calculated based upon the information within a communication frame. The communication network includes a wireless network, a wired network (e.g., an Ethernet network) and a data cable system that transmits a data over cable media access control (MAC) frame with an Ethernet/[ISO8802-3] type packet protocol data unit payload.

Claims

1. In computer system with an interface card for coupling to a communication network, the method comprising the steps of:

establishing access to a communication medium for the purpose of communicating a communication frame;

configuring said communication frame with an transmission indication section that indicates transmission of said communication frame is being aborted;

transmitting said communication frame over said communication medium; and

calculating a cyclical redundancy check value based upon initial information in said communication frame;

transforming said calculated cyclical redundancy check value so that it is non-matching with said communication frame by creating a ones compliment of said calculated cyclical redundancy check; and

appending said transformed cyclical redundancy check value to said communication frame instead of said calculated cyclical redundancy check value.

2. The method of claim 1 further comprising the steps of:

calculating a cyclical redundancy check value based upon initial information in a communication frame;

attaching said cyclical redundancy check value to said frame; and

changing said communication frame by altering bits in a data payload section of said communication frame without changing sid cyclical redundancy check value.

3. In communication network, a method for aborting communication frames, the method comprising the steps of:

a) establishing access to a communication medium for the purpose of communicating a communication frame;

b) configuring said communication frame to include a transmission indication section;

c) transmitting said communication frame over said communication medium, including;

calculating a cyclical redundancy check value based upon initial information in said communication frame;

transforming said calculated cyclical redundancy check value; and

appending said transformed cyclical redundancy check value to said communication frame instead of said calculated cyclical redundancy check value;

d) determining if said transmission of said communication frame should be aborted; and

e) manipulating information in said communication frame so that said transmission indication section indicates transmission of said communication frame is being aborted.

4. The method of claim 3 wherein step a) further comprises the steps of:

requesting access from a head end component to time frames for transmitting a data over cable media access control frame; and

granting a cable modem access to time frames for transmitting said data over cable media access control frame.

5. The method of claim 3 wherein step c) further comprises the steps of:

placing a non-matching cyclical redundancy check value in said transmission status section that indicates information in said data over cable media access control frame is to be aborted.

6. The method of claim 3 wherein transforming said calculated cyclical redundancy check value includes creating a ones compliment so that logical ones are changed to logical zeroes and logical zeros are changed to logical ones.

7. The method of claim 3 wherein step c) further comprises the steps of:

calculating a cyclical redundancy check value based upon initial information in said communication frame;

attaching said cyclical redundancy check value to said frame; and

changing said communication frame without changing said cyclical redundancy check value.

8. The method of claim 7 wherein changing said communication frame is accomplished by adding miscellaneous bits to a data payload section of said communication frame.

9. The method of claim 3 wherein step b) further comprises creating a preamble section, a MAC header section, a payload section, and a transmission status indicator section in said communication frame.

10. The method of claim 3 wherein step b) further comprises creating a data over cable media access control frame with and Ethernet/ISO8802-3 type packet protocol data unit payload.

11. The method of claim 3 wherein step b) further comprises the steps of inserting in said communication frame a plurality of high priority data indicators with high priority data between each one of said plurality of high priority data indicators.

12. The method of claim 3 further comprising the steps of:

receiving said fixed length data communication frame;

recognizing an indication that the transmission of the communication frame was aborted; and

discarding information.