Communication system and method for compressing information sent by a communication device to a target portable communication device

A method of communicating data stored on a first communication device to a second communication device comprising:

• receiving data by the first communication device;
• generating, by the first communication device, first and second dictionaries from the received data, the first dictionary being based on data received earlier than data used to generate the second dictionary, the first dictionary being provided to the second communication device;
• and
• sending the second dictionary to the second communication device if the second communication device is presently connected to the first communication device by a first channel there between exhibiting a cost of operation less than the cost of operation of a second channel there between;
• determining if the quality of the first dictionary is better than the quality of second dictionary;
• and
• compressing the data with the first dictionary to generate compressed data which is sent to the second communication device if the quality of the first dictionary is greater than the quality of the second dictionary and the second communication device is connected to the first communication device by the second channel.

A communication system comprising:

• a first communication device for receiving data;
• and
• a second communication device connectable to the first communication device by a first channel or a second channel there between, the first channel exhibiting a cost of operation less than the cost of operation of the second channel;
• the first communication device including first and second dictionaries which are generated in the first communication device, the first dictionary being based on data received earlier than data used to generate the second dictionary, the first dictionary being provided to the second communication device, the first communication device sending the second dictionary to the second communication device if the second communication device is presently connected to the first communication device by a first channel there between exhibiting a cost of operation less than the cost of operation of the second channel there between,
• wherein the first communication device schedules transmission of the second dictionary to the second communication device at a later time when the second communication device is connected to the first communication device by the first channel if the second communication device is not presently connected to the first communication device by the first channel.