Motorola Corporation

Motorola Mobility LLC

Stephane Laurent Baills

Armin Werner Klomsdorf

Christopher N Kurby

Gregory W Chance

Ouelid Abdesselem

Karine Griesmann

A method and apparatus for synchronizing a system clock with a serving cell () associated with a first radio access technology and monitoring an adjacent cell () associated with a second radio access technology is provided. A communication device () includes a first synchronization device () capable of synchronization with the serving cell () and a second synchronization device () capable of independently synchronizing with the adjacent cell (). The first synchronization device () and second synchronization device () include independent frequency correction modules (). Thus, the second frequency synchronization device () may be corrected per the adjacent cell () while the first synchronization device () remains synchronized with the serving cell (). Thus, the same corrected system clock may be used between two radio access technologies.

Method and apparatus for automatic frequency correction in a multimode device

The invention relates to a radio communication system in which a time slot of a frame of a multiframe signal allocated to the frequency control channel is modulated using an 8PSK modulation scheme to contain a tone having a frequency which GMSK modulation is unsuited to generate. This enables COMPACT-format signals to be distinguished from GSM-format signals and ensures backwards compatibility with all existing GSM mobile stations.

Radio communication system

Growing community of inventors

Toulouse, France

Stephane Laurent Baills