Patent ID: 6175733
Filing Date: 2001-01-16
Classification: H04W

Abstract:
A method for recovering communication service by a communication device after an interruption of communication service to the communication device, the communication device having created a serving and neighbor cell list (SNL) prior to the interruption of communication service, the method comprising:scanning the SNL in an attempt to detect an appropriate carrier signal having a sufficient signal quality and a sufficient signal strength;scanning a subset of frequencies selected from a learned bandmap in an attempt to detect an appropriate carrier signal;creating a list of any frequencies at which an appropriate carrier signal is detected while scanning the subset of frequencies selected from the first bandmap;alternately scanning the SNL and successive subsets of frequencies selected from the first bandmap while continuing to attempt to detect a suitable carrier signal;upon having not detected any suitable carrier signals, the method further comprising;ceasing the scanning a subset of frequencies selected from the learned bandmap;scanning a subset of frequencies selected from a regional bandmap in an attempt to detect an appropriate carrier signal; andcreating a list of any frequencies at which an appropriate carrier signal is detected while scanning the subset of frequencies selected from the regional bandmap.