Using rate matching attributes for differentiated QoS in UMTS networks

Abstract

We consider I transport channels on the downlink of an UMTS network, with rate matching attribute (RMA) values RMA/sub 1/, RMA/sub 2/,...RMA/sub I/, that are multiplexed on a single coded composite transport channel (CCTrCh). We derive analytical expressions for the bit error ratios (BERs) seen by each channel in the multiplex. Simulations indicate that the expressions are very accurate. We also provide a procedure that gives the RMA values required to achieve a target set of BERs for a specified signal-to-noise ratio; when no feasible RMA values exist, the procedure indicates that as well. The results of this paper will be of use to UMTS service providers who wish to provide differentiated QoS while maintaining high spectral efficiency.