Method and device in a mobile telecommunications system
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorCarl Patrik Cerwall
Life of this patent
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Abstract
The present invention relates to a method and an apparatus in a mobile telecommunications system for the re-establishment of a speech connection, especially one that risks being interrupted prematurely. A parameter (Q) indicating the quality of the traffic channel (TCH) on which the speech connection is implemented, is compared to a predetermined value (Q1). If the parameter (Q) is lower than said value (Q1) the speech connection (340) is parked temporarily on a dedicated control channel (DCCH) of high quality. When a traffic channel (TCH) again becomes idle (360) the speech connection is handed over (370) to this channel, which may either be associated with the base station originally serving the speech connection or another base station in the mobile telecommunications system.
Claims19
A method in a mobile telecommunications system in which payload information is communicated in traffic channels, control information is communicated in dedicated control channels and a speech connection between a first subscriber and a second subscriber is established on at least one first traffic channel, for re-establishing said established speech connection if it risks being interrupted, comprising the following steps:
- monitoring a parameter that represents the possibility of the established speech connection being interrupted while maintaining the established speech on said at least one first traffic channel;
- handing over the speech connection from said at least one first traffic channel to a dedicated control channel if said parameter is less than a predetermined value;
- and
- handing over the speech connection from the dedicated control channel to at least one second traffic channel as soon as at least one such channel is available.
An apparatus in a mobile telecommunications system comprising at least one base station controller, at least two base stations and a number of mobile stations, in which payload information is communicated through traffic channels, on which control information is communicated through dedicated control channels and in which a speech connection through a first subscriber and a second subscriber is established on at least one traffic channel between a certain mobile station and a base station in order to re-establish said speech connection if it risks being interrupted, including a control unit, wherein
- said at least one base station controller monitors said established speech connection between the first subscriber and the second subscriber and provides said control unit with a set of parameters indicating characteristics of said speech connection,
- that said control unit generates a parameter based on said set of parameters, said parameter indicating the quality of said speech connection,
- that said control unit compares the value of the parameter with a predetermined threshold value, whereby said control unit generates a first signal to said base station controller if the value of the parameter is less than the threshold value,
- that said base station controller when receiving said first signal hands over said established speech connection from said traffic channel to a dedicated control channel if there is no idle alternative traffic channel, for which the value of said parameter exceeds that of said traffic channel,
- that said control unit detects if there is an idle traffic channel with the base station serving said speech connection and that said control unit when said idle channel is found, hands over said speech connection to this channel.
Dependencies are inferred from the claim text.