Receiver based adaptive modulation scheme

A remote unit for a radio communication system, the remote unit including a decoder which decodes a signal received from a base station using a current Link Mode (LM), a LM being a set of at least one transmission parameter, and the remote unit comprising:

• means for storing a sequence of allowed LMs, each LM having a sequential position within the sequence;
• means for determining a channel quality of the signal;
• means for determining a desired LM from amongst the sequence of allowed LMs based on the channel quality;
• means for determining a sequential difference defined as a difference between the sequential position of the current LM and the sequential position of the desired LM;
• means for transmitting the sequential difference to the base station;
• and
• means for setting a new current LM to be the desired LM.

A base station for a radio communication system, the base station transmitting a signal to a remote unit using a current Link Mode (LM), a LM being a set of at least one transmission parameter, the base station comprising:

• means for maintaining a sequence of allowed LMs, each LM having a sequential position within the sequence;
• means for receiving from the remote unit a sequential difference defined as a difference between the sequential position of the current LM and the sequential position of a desired LM, the desired LM belonging to the sequence of allowed LMs;
• and
• means for setting a new current LM using the sequential difference.