The code space associated with the communication system is divided into at least two subspaces where each subspace is assigned to a different mode of operation. In one mode, such as a voice mode, each user is given full time access to a portion of the subspace associated with that mode of operation....http://www.google.com/patents/US8149684?utm_source=gb-gplus-sharePatent US8149684 - Code space sharing among multiple modes of operation
