Method of maintaining an established connection in a mobile radi

Details Method of maintaining an established connection in a mobile radi Method of maintaining an established connection in a mobile radi

1990-04-11

1993-10-26

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455 541, 455 63, 375 5, 375 11, 375101, 379 60, H04Q 700

Patent

active

052574016

ABSTRACT:
The invention relates to a method in a mobile radio system having both digital and analog radio channels. An object of the invention is that a connection established on a digital radio channel often shall be possible to maintain even when the time dispersion on available digital radio channels exceeds the designed maximum time dispersion of equalizers in receiving stations. According the invention equalizers in the receivers of the system may be designed for a smaller maximum time dispersion than the total time dispersion the whole system shall be capable to handle. Instead handoff is made to an other channel when the time dispersion of a used digital channel tends to become too big. When an other digital radio channel with low time dispersion is available handoff is preferably done to this channel. Alternatively or in the absence of such a digital radio channel handoff is performed to an analog radio channel.

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A. Baier et al., "Bit Synchronization and Timing Sensitivity in Adaptive Viterbi Equalizers for Narrowband-TDMA Digital Mobile Radio Systems", 38th IEEE Vehicle Technology Conference, Jun. 15-17, 1988.

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