Method of maintaining an established connection in a mobile radio system comprising both analog and digital radio channels
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United States of America Patent
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Oct 26, 1993
Issued Date -
N/A
app pub date -
Apr 11, 1990
filing date -
Apr 17, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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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