Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reexamination Certificate
1999-05-20
2001-03-06
Patel, Ajit (Department: 2738)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
C370S477000, C714S748000
Reexamination Certificate
active
06198735
ABSTRACT:
RELATED APPLICATIONS
The following applications are related to this application and are filed on the date herewith. The disclosure of each of these related applications is incorporated by reference: Ser. No. 09/315,277, filed May 20, 1999 titled “METHOD FOR CHANGING COMMUNICATION IN A COMMUNICATION SYSTEM, AND COMMUNICATION SYSTEM THEREFOR”; Ser. No. 09/315,696, filed May 20, 1999, titled “METHOD FOR ESTABLISHING COMMUNICATION IN A PACKET NETWORK”; Ser. No. 09/315,309, filed May 20, 1999, titled “SESSION BASED BILLING IN A COMMUNICATION SYSTEM”; Ser. No. 09/315,314, filed May 20, 1999, titled “COMMUNICATION NETWORK METHOD AND APPARATUS”; Ser. No. 09/315,467, filed May 20, 1999, titled “METHOD AND SYSTEM FOR PROCESSING INTELLIGENT NETWORK COMMANDS IN A COMMUNICATIONS NETWORK”; Ser. No. 09/315,653, filed May 20, 1999, titled “METHOD AND SYSTEM FOR NETWORK SERVICE NEGOTIATION IN A TELECOMMUNICATIONS SYSTEM”; Ser. No. 09/315,465, filed May 20, 1999, titled “METHOD AND APPARATUS FOR ROUTING PACKET DATA IN A COMMUNICATIONS SYSTEM”; Ser. No. 09/315,466, filed May 20, 1999, titled “METHOD AND SYSTEM FOR INTRODUCING NEW SERVICES INTO A NETWORK”.
FIELD OF THE INVENTION
The invention relates generally to communication systems, and more particularly to a method and communication system for retransmitting a data packet in a packet network.
BACKGROUND OF THE INVENTION
Current header compression is used on point-to-point (PPP) networks. Such compression reduces TCP/IP overhead from about 40 bytes to 4 bytes. In typical packet data networks, packets are often dropped at a selection distribution unit, due to the bottleneck provided on the over the air radio link. Dropped packets cause a lack of synchronization in the compression mechanism and lead to significant degradation of TCP throughput.
A common method of header compression is referred to as Van Jacobson header compression. Van Jacobson header compression works, in a general sense, based on delta-encoding between two end points in a PPP link. Each packet is sent with a sequence number. Rather than sending the sequence number in the header, the header includes a field that indicates the change in sequence number from the previous packet. This allows for compressed headers, due to the lessening of the data field required for the delta.
One problem associated with such a compression scheme is that if a packet gets dropped between end points in the PPP network, the delta information in the header relating to the sequence number is no longer valid. Successive packets are dropped because of a mismatch between the sequence number and the checksum. As a result, multiple packets are dropped, and the system does not right itself until the sender times out due to not receiving an acknowledgement from the receiver in time. Consequently, multiple packets are lost, and additional time is required to get the packet network re-synchronized.
Thus, a need exists for a method for retransmitting a data packet in a packet network which provides for increased reliability and fewer dropped packets.
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patent: 5815667 (1998-09-01), Chien et al.
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Ali Irfan
Pazhyannur Rajesh S.
Haas Kenneth A.
Motorola Inc.
Patel Ajit
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