Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
1998-07-09
2001-05-29
Trost, William G. (Department: 2746)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S452200, C455S453000
Reexamination Certificate
active
06240298
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to conversation channel allocation methods applicable to mobile communication systems based on the MCA method using control channels. This application is based on patent application No. Hei 9-188722 filed in Japan, the content of which is incorporated herein by reference.
2. Description of the Related Art
It is well known in the mobile communication systems of the MCA method that control channels are fixedly used for transmission of control signals while conversation channels are fixedly used for conversation. Each mobile station performs radio communication using any one of the control channels with respect to a base station, so that a calling party is capable of performing conversation with a called party. Herein, the conversation channel is selected from among prescribed conversation channels, which are prepared in advance. So, a selected conversation channel is allocated to each mobile station.
As described above, the conventional mobile communication systems are designed in such a manner that the conversation channels are fixed. So, if a number of the used conversation channels reaches a maximum number of channels in response to an increase of traffic, a congested state occurs, which causes the problem in which a new mobile station cannot start conversation.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a conversation channel allocation method that enables a new mobile station to start conversation even if all of the conversation channels are currently being used for conversations in a mobile communication system.
This invention provides a conversation channel allocation method for a mobile communication system of MCA method that performs allocation of conversation channels between base stations and mobile stations. During a congestion state in which all of the conversation channels are currently being used for conversations, when a new conversation request is given from a mobile station, a control channel, which is originally used for transmission of a control signal, is allocated to that mobile station as a new conversation channel. Thus, the mobile station is capable of performing radio communication with the base station by using the control channel, so that a calling party is capable of performing conversation with a called party without interruption.
When the conversation is completed, the control channel is restored by canceling its function as the new conversation channel. If any one of the conversation channels ends conversation prior to completion of the conversation using the control channel so that it now becomes a vacant conversation channel, the control channel is restored by canceling its function as the new conversation channel while the vacant conversation channel is allocated to the conversation that was being carried by the control channel.
In order to avoid jamming, the base station transmits a signal of low frequency tone, which is out of range of a prescribed conversation band, to other mobile stations to inform them that of the control channel is being utilized for a conversation by a mobile station, so that the other mobile stations will display a message of “conversation in progress”, for example. In addition, adjacent base stations stop transmitting control signals, so that their mobile stations will display a message of “out of communication service range”, for example.
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NEC Corporation
Ostrolenk Faber Gerb & Soffen, LLP
Sobutka Philip J.
Trost William G.
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