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Method and apparatus for adaptively companding data packets in a data communication system
| Details |
Inventors: Geiger, Robert L.;
Assignee: Motorola, Inc, (Schaumburg, IL)
Primary Examiner: Marcelo; Melvin
Assistant Examiner:
Attorney, Agent or Firm: Crilly; Daniel C.
A data communication system (100) employs a method and apparatus for adaptively companding (compressing and expanding) data packets therein. A first communication device (e.g., 107) generates a plurality of data packets (201-207) and selects one or more, but not all, of the data packets. The first device then performs a compression of each data packet in a first group of data packets that includes the selected data packets (202-205). The first device transmits the compressed data packets to a second communication device (e.g., 108). Upon receiving the compressed data packets, the second device determines whether the received compressed data packets include one or more of the data packets selected by the first device. When the received data packets include one or more of the selected data packets, the second device transmits a response packet (301) to the first device indicating which, if any, of the selected data packets were received. Upon receipt of the response packet, the first device performs an adaptive compression of each data packet in a second group of data packets based on the response packet and transmits the adaptively compressed data packets to the second device. The second device expands the adaptively compressed data packets based on which selected data packets were received in the previous transmission. |
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DETAILED DESCRIPTION I claim: 1.
A method for adaptively compressing data packets for transmission between a first communication device and a second communication device, the method comprising the steps of: a) generating, by the first communication device, a plurality of data packets; b) selecting, by the first communication device, at least one of the plurality of data packets to produce at least one selected data packet, wherein a quantity of the at least one selected data packet is less than the plurality of data packets; c) performing, by the first communication device, a first compression of each data packet in a first group of the plurality of data packets that includes the at least one selected data packet to produce compressed data packets; d) transmitting, by the first communication device, the compressed data packets to the second communication device; e) receiving, by the second communication device, the compressed data packets to produce received compressed data packets; f) determining, by the second communication device, whether the received compressed data packets include the at least one selected data packet; g) when the received compressed data packets include the at least one selected data packet, transmitting, by the second communication device, a response packet to the first communication device, the response packet indicating which selected data packets of the at least one selected data packet were received by the second communication device; and h) upon receipt of the response packet, performing, by the first communication device, a second compression of each data packet in a second group of the plurality of data packets based on the response packet to produce adaptively compressed data packets.
2.
The method of claim 1, wherein each of the plurality of data packets includes a selection flag, and wherein step (b) further comprises the step of setting the selection flag of each selected data packet to indicate that a particular data packet has been selected.
3.
The method of claim 2, wherein step (f) comprises the step of determining whether the selection flag of at least one of the received compressed data packets is set
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Finance 
