Cable modem system and method for dynamically mixing protocol specific header suppression techniques

1. A method for dynamically mixing header suppression techniques for transmitting data over a Data Over Cable Service Interface Specification (DOCSIS) network, comprising the steps of:

(a) communicating a plurality of header suppression techniques and a unique index number assigned to each of the plurality of header suppression techniques to a cable modem termination system;

(b) receiving a plurality of data packets to be transmitted;

(c) identifying which of the received data packets have a header that should be suppressed;

(d) selecting a header suppression technique from the plurality of header suppression techniques for each of the identified data packets;

(e) appending a packet header element to each of the identified data packets, the packet header element containing the index number assigned to the header suppression technique selected for each of the identified data packets; and

(f) suppressing a header of each of the identified data packets using the header suppression technique selected for each of the identified data packets; and

(g) concatenating each data packet within a single DOCSIS transmit burst to form a mixed protocol burst, the mixed protocol burst comprising a plurality of data packets having headers suppressed in accordance with a corresponding plurality of header suppression techniques.

2. The method of claim 1 , further comprising the step of:

(h) transmitting the mixed protocol burst to the cable modem termination system.

3. The method of claim 1 , wherein each of the received data packets that are unknown Internet Protocol (IP) packets are identified as having a header that should be suppressed in said identifying step (c).

4. The method of claim 3 , wherein DOCSIS payload header suppression is selected in said selecting step (d) for each of the received data packets that are unknown IP packets.

5. The method of claim 1 , wherein each of the received data packets that are Internet Protocol (IP)/Real-Time Transfer Protocol (RTP) packets with dynamically changing patterns are identified as having a header that should be suppressed in said identifying step (c).

6. The method of claim 5 wherein RTP suppression is selected in said selecting step (d) for each of the received data packets that are IP/RTP packets with dynamically changing patterns.

7. The method of claim 1 , wherein each of the received data packets that are Internet Protocol (IF)/Transmission Control Protocol (TCP) variable length packets are identified as having a header that should be suppressed in said identifying step (c).

8. The method of claim 7 , wherein dynamic delta encoding suppression is selected in said selecting step (d) for each of the received data packets that are IP/TCP variable length packets.

9. A method for expanding data packet headers transmitted over a Data Over Cable Service Interface Specification (DOCSIS) network, comprising the steps of:

(a) receiving a mixed protocol burst comprising a plurality of data packets having headers suppressed in accordance with a corresponding plurality of header suppression techniques, the data packets being concatenated within a single DOCSIS transmit burst;

(b) identifying each data packet within the mixed protocol burst that has a suppressed header;

(c) searching a lookup table to select a set of rules from a plurality of sets of rules for expanding a suppressed header of each of the data packets identified in step (b); and

(d) expanding a suppressed header of each of the data packets identified in step (b) according to a set of rules selected in step (c).

10. The method of claim 9 , wherein each data packet identified in said identifying step (b) has an appended packet header element containing an index number.

11. The method of claim 10 , wherein said searching step (c) uses each index number contained in each appended packet header element to search the lookup table.

12. The method of claim 11 , wherein DOCSIS payload header expansion rules are used in said expanding step (d) for unknown Internet Protocol (IP) packets.

13. The method of claim 11 wherein Real-Time Transfer Protocol (RTP) expansion rules are used in said expanding step (d) for Internet Protocol (IP)/RTP packets with dynamically changing patterns.

14. The method of claim 11 , wherein dynamic delta encoding expansion rules are used in said expanding step (d) for Internet Protocol (IP)/Transmission Control Protocol (TCP) variable length packets.

15. A system for dynamically mixing header suppression techniques transmitted over a Data Over Cable Service Interface Specification (DOCSIS) network, comprising:

one or more cable modems that suppress data packet headers by selectively using one of a plurality of header suppression techniques wherein said one or more cable modems concatenates each data packet having a suppressed header into a single DOCSIS transmit burst to form a mixed protocol burst, the mixed protocol burst comprising a plurality of data packets having headers suppressed in accordance with a corresponding plurality of header suppression techniques; and

a cable modem termination system (CMTS) enabled to expand said data packet headers by using a set of expansion rules corresponding to said selected one of said plurality of header suppression techniques, wherein said one or more cable modems assigns a unique index number to each one of said plurality of header suppression techniques.

16. The system of claim 15 , wherein said one or more cable modems appends a packet header element to each data packet having a suppressed header, wherein said packet header element includes said unique index number assigned to the header suppression technique used to suppress each data packet header.