Method to perform 
link adaptation at the radio interfaces of an enhanced packet data 
cellular network handling several Modulation and Coding Schemes (MCS) for maximizing data 
throughput. In a preliminary off-line step the 
system behaviour, in terms of net 
throughput of the various available MCSs, is simulated for different C / l conditions. From the 
simulation two sets of tables are obtained, each table including 
upgrade and 
downgrade thresholds expressed in terms of 
Block Error Rate (BLER). Thresholds correspond to switching points from an MCs to the two available MCSs having the immediate less or more protection. The two sets of tables are referred to higher or lower diversity RF environments and are further specialized for taking into account EGPRS type II 
hybrid ARQ, namely 
Incremental Redundancy (IR). During transmission the transmitted blocks are checked for FEC and the results are sent to the network. The network continuously updates BLER using 
exponential smoothing. In order to achieve the correct 
time response, in 
spite of that RLC blocks can be received or not, a reliability filter is provided whose output is used to decide the weight between the new and old measurements to make the BLER 
filter impulse response exponentially decreasing with time. The IR efficiency is tested for each incoming block and an indicative variable IR status is filtered using the same approach used for BLER. Each actual threshold of BLER to be used in 
link adaptation is obtained by a linear interpolation between the tabulated threshold without IR and with perfect IR, both weighed with filtered IR status. Filtered BLER is then compared with said interpolated thresholds for testing the incoming of a MCS switching condition. 
Power control pursues the goal of maintaining constant QoS peak 
throughput per time slot(Fig 16).