Patent ID: 6625165
Filing Date: 2003-09-23
Classification: H04L

Abstract:
A method for use in communicating data over a wireless interface, said wireless interface being adapted to use a plurality of constellation mapping schemes to map bits of said data to symbols, the method comprising the steps of:segmenting a network layer packet into radio data link packets; appending an error detecting code to each of said radio data link packets; segmenting data of said appended-to radio data link packet into pieces sized suitably for insertion into time slot of a fixed number of symbols, the number of data bits contained within each one of said time slots being a function of a particular one of said constellation mapping schemes employed for said each time slot; appending an error detecting code to each of said time slot sized pieces using for each time slot its respective one of said constellation mapping schemes; transmitting said appended-to time slot over said wireless interface; determining that an error occurred at a receiver in reception of at least one of said appended-to radio data link packets; and retransmitting no more than the data contained within said appended-to radio data link packet containing said error and any required overhead for said retransmission employing a constellation mapping for said retransmitted data that is a function of a channel quality at the time of said retransmission.