Handover method for mobile radio system

Telecommunications – Transmitter and receiver at separate stations

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379 60, H04Q 700

Patent

active

051095289

ABSTRACT:
The invention relates to a method in mobile radio systems in which the responsibility for transmitting message information to a mobile station is handed over from a first base station transmitter to a second base station transmitter. In this method, the same radio channel is used, if possible, before and after the handover for transmitting message information to the mobile station. If the same radio channel can be utilized, the handover takes place without the mobile station being informed beforehand of the handover by a special signal or order or the like. In digital mobile ratio systems with digital transmission of message information by digital modulation of the radio signals, the transmission is preferably started from a second base station transmitter before the transmission is terminated from a first base station transmitter. During a certain transmission time substantially the same message information is transmitted to the mobile station from both the first and second base station transmitters.

REFERENCES:
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"User Access in Portable Radio Systems," Bernhardt, Jun. 1987, Bell Research Inc.
"RF Performance of Macroscopic Diversity in Universal Digital Portable Radio Communications," Bernhardt, Jun. 1986, IEEE Conference.
Japanese Patent Abstrct vol. 9, No. 169 (E-328).

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