Handover method for mobile radio system
First Claim
1. In a mobile radio communication system comprising base stations and mobile stations and a plurality of radio channels for transmitting control information and message information between base stations and mobile stations, said base stations and mobile stations including radio transmitters and radio receivers for a plurality of radio channels, a method for handing over the responsibility for transmitting message information to a mobile station from at least one first base station transmitter to at least one second base station transmitter, comprising the steps of:
- before handing over the responsibility carrying out a test in the stationary part of the system to see whether after the handover the second base station transmitter can use the same radio channel for transmitting message information to the mobile as the radio channel used by the first base station transmitter before handover; and
if the test result is positive then using the same radio channel after the handover as before for transmitting message information to the mobile.
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Accused Products
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.
273 Citations
6 Claims
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1. In a mobile radio communication system comprising base stations and mobile stations and a plurality of radio channels for transmitting control information and message information between base stations and mobile stations, said base stations and mobile stations including radio transmitters and radio receivers for a plurality of radio channels, a method for handing over the responsibility for transmitting message information to a mobile station from at least one first base station transmitter to at least one second base station transmitter, comprising the steps of:
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before handing over the responsibility carrying out a test in the stationary part of the system to see whether after the handover the second base station transmitter can use the same radio channel for transmitting message information to the mobile as the radio channel used by the first base station transmitter before handover; and if the test result is positive then using the same radio channel after the handover as before for transmitting message information to the mobile. - View Dependent Claims (2, 3)
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4. In a mobile radio communication system comprising base stations and mobile stations having radio transmitters and radio receivers for transmitting control information and message information therebetween, a method for handing over the responsibility for transmitting message information to a mobile station from at least one first base station transmitter to at least one second base station transmitter comprising the steps of:
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starting the transmission of message information to the mobile station from the second base station transmitter before terminating the transmission of message information to the mobile station from the first base station transmitter; and transmitting substantially the same message information during a transition period from both the first base station transmitter and the second base station transmitter. - View Dependent Claims (5, 6)
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Specification