A system and method in a wireless communications environment maximizes voice quality in low capacity situations. A Mobile services Switching Centre (MSC) that is associated with a base station of a cell is capable of assigning speech calls of mobile terminals to either a full-rate (FR) or a half-rate...http://www.google.fr/patents/US6292664?utm_source=gb-gplus-shareBrevet US6292664 - Channel quality in wireless communications
