Method of disconnecting an established communication connection in a mobile radio system
First Claim
1. A method of disconnecting a communications connection established between a mobile station and a network in a mobile radio system in which communication between the network and a plurality of mobile stations takes place over a number of communications channels and in which communication over an allocated communications channel between the network and a given mobile station is commenced and terminated in response to normal signalling from the network to the mobile station, comprising the steps of:
- detecting, in the network, a state of the allocated communications channel which indicates that communication on the allocated channel has been degraded and therefore shall be disconnected;
sending a first signal from the network to the mobile station;
sending, upon receipt of the first signal, an acknowledgement signal from the mobile station to the network and activating a time monitoring process;
sending, upon receipt of the acknowledgement signal, a second signal from the network to the mobile station;
wherein the second signal, when received by the mobile station, prevents the time monitoring process from stopping, whereby the mobile station relinquishes the allocated communications channel; and
sending a second acknowledgement signal responsive to the relinquish from the mobile station to the network in order to inform the network about the relinquished communications channel.
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Accused Products
Abstract
A method of forcibly disconnecting a communications connection established between a mobile station and a mobile services switching network, depending on whether the communications connection initially allocated to the mobile station has deteriorated or that a call connection or a handover attempt has failed. With the intention of forcing the mobile station to relinquish the allocated channel, the network transmits to the mobile station a signal which activates a time monitoring process in the mobile station, which thereby sends an acknowledgement signal back to the network. When the network does not wish the mobile station to retain the allocated channel, a signal which would stop the time monitoring process is not sent to the mobile station, thereby resulting in the release of the communications channel. Also described is a mobile station which includes counter-circuits for effecting the time monitoring process.
47 Citations
6 Claims
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1. A method of disconnecting a communications connection established between a mobile station and a network in a mobile radio system in which communication between the network and a plurality of mobile stations takes place over a number of communications channels and in which communication over an allocated communications channel between the network and a given mobile station is commenced and terminated in response to normal signalling from the network to the mobile station, comprising the steps of:
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detecting, in the network, a state of the allocated communications channel which indicates that communication on the allocated channel has been degraded and therefore shall be disconnected; sending a first signal from the network to the mobile station; sending, upon receipt of the first signal, an acknowledgement signal from the mobile station to the network and activating a time monitoring process; sending, upon receipt of the acknowledgement signal, a second signal from the network to the mobile station; wherein the second signal, when received by the mobile station, prevents the time monitoring process from stopping, whereby the mobile station relinquishes the allocated communications channel; and sending a second acknowledgement signal responsive to the relinquish from the mobile station to the network in order to inform the network about the relinquished communications channel. - View Dependent Claims (2, 3, 4)
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5. In a mobile radio system comprising a plurality of mobile stations and a mobile radio network which signals to the mobile stations to set up connections over allocated communications channels and to disconnect such connections when the allocated channels become degraded, a mobile station comprising:
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a transmitter unit; a receiver unit comprising; means for detecting signals from the mobile radio network, the detecting means including means for detecting and correcting errors, and a processor unit comprising a time monitoring unit activated upon receipt of synchronizing signals from the network and set to a synchronizing signal time limit which shall not be exceeded if a communications channel allocated to the mobile station is to be retained, wherein when the receiver unit detects a first synchronizing signal correctly, the processor unit activates the time monitoring unit, thereby initiating a time measuring process, and causes the transmitter unit to send an acknowledgement signal to the network; and
when the receiver unit detects a second synchronizing signal that is subsequently sent from the network and that cannot be detected correctly by the mobile station, the time monitoring unit remains activated, whereby the mobile station relinquishes the allocated communications channel when the synchronizing signal time limit is exceeded and sends a second acknowledgement signal responsive to the relinquish from the mobile station to the network in order to inform the network about the relinquished communications channel. - View Dependent Claims (6)
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Specification