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Call control method for a radio system
| Details |
Inventors: Lopponen, Jussi;
Assignee: Nokia Telecommunications Oy (Espoo, FI)
Primary Examiner: Kuntz; Curtis
Assistant Examiner: Lin; Mary M.
Attorney, Agent or Firm: Cushman, Darby & Cushman
A call control method for a radio system, wherein a half-duplex type mobile station (MS1, MS2) is commanded so as to clear a call on the radio channel of a base station (BS), by transmitting a disconnect signal to the mobile station (MS1, MS2) over the radio channel, the mobile station leaving the radio channel upon receiving the disconnect signal. In order to ensure that the disconnect signal is received by the mobile station, the field intensity received by the base station (BS) on the radio channel is measured immediately after the transmission of the disconnect signal, and the radio channel is released for the next call only when the measured field intensity falls below a predetermined threshold value. |
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DETAILED DESCRIPTION The invention relates to a call control method for a radio system, wherein a half-duplex type mobile subscriber radio station is commanded so as to clear a call on a radio channel of a base station, by transmitting a disconnect signal to the mobile subscriber radio station over the radio channel, the mobile subscriber radio station leaving the radio channel on receiving the disconnect signal.
BACKGROUND OF THE INVENTION A half-duplex type transceiver transmits and receives on the same radio channel and is not able to receive while its own transmitter is in operation.
This property of the half-duplex mobile radio may result in a situation in which the transmitter of the mobile radio is in operation when the call terminates during a call disconnect signal transmitted from the mobile exchange, and does not receive the disconnect signal but remains on the traffic channel even though the mobile exchange has cleared the call and released the traffic channel.
The same channel can be allocated to a new call immediately after the release, and so the mobile radio remaining on the traffic channel after a preceding call may undesirably participate in the new call or at least hear the beginning of the call.
Previously, attempts have been made to solve this problem by transmitting special selective disconnect messages on the traffic channel in the beginning of the call, which messages command the mobile radios not associated with the current call to leave the channel.
If the transmitter of the mobile radio remaining on the channel after the preceding call is still or again in operation even when such disconnect messages are being transmitted, the mobile radio does not receive the messages and will not leave the channel.
Such disconnect messages can be transmitted continuously during the call, in which case they, however, deteriorate the call quality, causing short breaks.
SUMMARY OF THE INVENTION The object of the invention is to avoid the above-mentioned problems of the prior art
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Ring Tones 
