Multimode terminal and method of synchronizing such terminal
First Claim
1. A multimode communication terminal comprising a first modulation/demodulation circuit adapted to communicate with a first radio access network and at least a second modulation/demodulation circuit adapted to communicate with a second radio access network different from the first radio network, characterized in that it comprises a synchronization module comprising means for determining a frequency difference between the first modulation/demodulation circuit and the first radio access network and means for synchronizing the second modulation/demodulation circuit with the second radio access network so as to allow said terminal to compare permanently transmission qualities over the first and second radio access networks.
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Accused Products
Abstract
The invention relates to a multimode communication terminal comprising a first modulation/demodulation circuit adapted to communicate with a first radio access network and at least a second modulation/demodulation circuit adapted to communicate with a second radio access network different from the first radio network.
The terminal according to the invention comprises a synchronization module provided with means for determining a frequency difference between the first modulation/demodulation circuit and the first radio access network and means for synchronizing the second modulation/demodulation circuit with the second radio access network so as to allow said terminal to compare permanently transmission qualities over the first and second radio access networks.
20 Citations
21 Claims
- 1. A multimode communication terminal comprising a first modulation/demodulation circuit adapted to communicate with a first radio access network and at least a second modulation/demodulation circuit adapted to communicate with a second radio access network different from the first radio network, characterized in that it comprises a synchronization module comprising means for determining a frequency difference between the first modulation/demodulation circuit and the first radio access network and means for synchronizing the second modulation/demodulation circuit with the second radio access network so as to allow said terminal to compare permanently transmission qualities over the first and second radio access networks.
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19. A method of evaluating transmission quality of a multimode terminal via at least two different radio access network, that is a first active radio access network and a second passive radio access network, wherein that it comprises the following steps:
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measuring a first frequency difference between the terminal and the active radio access network, estimating a second frequency difference between the active radio access network and the passive access network, calculating a third frequency difference between said terminal and the passive access network according to the first and second frequency differences, using this third frequency difference to synchronize the terminal with the passive access network, evaluating the quality of the communication over the passive network, comparing the measured quality of the communication over the passive network with the communication quality over the active access network, switching to the passive radio access network if this network presents a better communication quality than the active access network. - View Dependent Claims (20, 21)
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Specification