Automatic cell transfer system with error rate assessment
First Claim
1. A cell transfer method for automatically transferring communication between a mobile and a first base station from said first base station to a selected second base station comprising, transmitting messages from each base station of a plurality of base stations, said mobile monitoring said messages transmitted by said first base station and received by said mobile and determining a bit or symbol error rate based on the received signal for at least some of said messages transmitted from said first station and received by said mobile, when said mobile detects a bit or symbol error rate in said at least some messages received from said first station above a threshold exit bit or symbol error rate, said mobile automatically sequentially monitoring and assessing said messages transmitted from adjacent of said base stations, selecting a selected second base station based on said messages from said selected second base station having an assessed bit or symbol error rate as detected by said mobile below a selected entry threshold bit or symbol error rate and said mobile transferring to communicate with said selected second base station.
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Accused Products
Abstract
An automatic cell transfer is made, when a mobile detects certain threshold exit bit or symbol error rate in a message transmitted from the base station with which it is communicating, by the mobile then sampling sequentially transmitted messages from adjacent base stations (on the same or different frequencies) and monitoring their bit or symbol error rates until a base station is found having a bit or symbol error rate less than a preselected minimum entry threshold bit or symbol error rate which in turn is less than the exit bit or symbol error rate and transferring communication from the mobile to the base station so selected. In one arrangement, each base station repeatedly and intermittently transmits a known quality assessment message and the mobile continually reviews the received message for its error rate.
45 Citations
7 Claims
- 1. A cell transfer method for automatically transferring communication between a mobile and a first base station from said first base station to a selected second base station comprising, transmitting messages from each base station of a plurality of base stations, said mobile monitoring said messages transmitted by said first base station and received by said mobile and determining a bit or symbol error rate based on the received signal for at least some of said messages transmitted from said first station and received by said mobile, when said mobile detects a bit or symbol error rate in said at least some messages received from said first station above a threshold exit bit or symbol error rate, said mobile automatically sequentially monitoring and assessing said messages transmitted from adjacent of said base stations, selecting a selected second base station based on said messages from said selected second base station having an assessed bit or symbol error rate as detected by said mobile below a selected entry threshold bit or symbol error rate and said mobile transferring to communicate with said selected second base station.
- 6. A method for assessing the bit or symbol error rate for the signals received by a mobile from a base station or vice versa comprising receiving a message, correcting said received message using error correcting codes to provide a corrected message, comparing said received message with said corrected message and determining the difference between the two messages to provide said bit or symbol error rate.
Specification