Communication system having means for enabling channel assignment to calling terminal according to priority
First Claim
1. A communication system comprising a switching office and a service area including therein terminals of a fixed and a mobile type selectively communicating with the switching office through a plurality of radio channels,each of said terminals having means for producing a call setup request including its own terminal information to send out, as a particular terminal, said call setup request being transmitted to said switching office,said switching office comprising:
- channel state memory means for storing information as to whether said radio channels are currently idle or busy and which ones of said fixed and mobile terminals currently use the busy channels; and
channel assigning means responsive to said call setup request for looking up said channel state memory means to assign one of said idle channels to said particular terminal, while renewing said channel state memory means, wherein any one of said idle channels is assignable to said particular terminal of said fixed and said mobile terminals.
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Accused Products
Abstract
In assignment of radio channels to terminals for communication with a switching office, one of currently idle channels can be assigned to a calling terminal by use of a channel state memory in the office which memory stores channel numbers and terminal information currently using channels. The office further includes a terminal memory for storing the maximum number separately predetermined for each of fixed and mobile types of the terminals assignable to the channels. The calling terminal is rejected to be assigned with any idle channel when the maximum number is equal to the current number of terminals currently using channels which are same as the type of the calling terminal. In another aspect, the terminal memory further stores information that the fixed type has a priority. An idle channel is assigned to a calling one of fixed type terminals even when the maximum number for the fixed type is equal to or smaller than the current number. In other aspect, the channel state memory stores receiving signal strengths at terminals currently using the channels. When a calling is originated from one of fixed type terminals and when all of the channels are currently used, one of the mobile terminals using a specific channel at the lowest one of the receiving signal strengths is forced to release the specific channel, which channel is in turn assigned to the calling fixed type terminal.
54 Citations
8 Claims
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1. A communication system comprising a switching office and a service area including therein terminals of a fixed and a mobile type selectively communicating with the switching office through a plurality of radio channels,
each of said terminals having means for producing a call setup request including its own terminal information to send out, as a particular terminal, said call setup request being transmitted to said switching office, said switching office comprising: -
channel state memory means for storing information as to whether said radio channels are currently idle or busy and which ones of said fixed and mobile terminals currently use the busy channels; and channel assigning means responsive to said call setup request for looking up said channel state memory means to assign one of said idle channels to said particular terminal, while renewing said channel state memory means, wherein any one of said idle channels is assignable to said particular terminal of said fixed and said mobile terminals.
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2. A communication system comprising a switching office and a service area including therein terminals of a fixed and a mobile type selectively communicating with the switching office through a plurality of radio channels,
each of said terminals having means for producing a call setup request including its own terminal information to send out, as a particular terminal, said call setup request being transmitted to said switching office, said switching office comprising: -
channel state memory means for storing information as to whether said radio channels are currently idle or busy and which ones of said fixed and mobile terminals currently use the busy channels; and channel assigning means responsive to said call setup request for looking said channel state memory means to assign one of said idle channels to said particular terminal, while renewing said channel state memory means;
whereinsaid terminal information includes type information representing, as a particular type, said particular terminal itself, and said switching office further comprises; terminal data memory means for storing the maximum number separately predetermined for each of said fixed and mobile types of said terminals assignable to said plurality of radio channels; said channel assigning means looking said terminal data memory means and said channel state memory means to compare the maximum number of the type corresponding to said particular type and the current number of terminals of the type corresponding to said particular type currently using the busy channels, said channel assigning means assigning one of current idle channels to said particular terminal when said maximum number is larger than said current number. - View Dependent Claims (3, 4)
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5. A communication system comprising a switching office and a service area including therein terminals of a fixed and a mobile type selectively communicating with the switching office through a plurality of radio channels,
each of said terminals comprising: -
receiving means for receiving a system information broadcast from said switching office through a radio control channel, said system information comprising channel state information whether said radio channels are currently idle or busy and which ones of said fixed and mobile terminals currently use the busy channels; and calling means for referring to said channel state information to select, as a particular channel, one of the idle channels, said calling means producing a call setup request including its own terminal information together with said particular channel to send out, as a particular terminal, said call setup request being transmitted to said switching office, said switching office comprising; channel state memory means for storing said channel state information; broadcasting means for broadcasting said system information through said radio control channel; and channel assigning means responsive to said call setup request for assigning said particular channel to said particular terminal to renew said channel state memory means, wherein any of said idle channels is assignable to said particular terminal of said fixed and said mobile terminals.
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6. A communication system comprising a switching office and a service area including therein terminals of a fixed and a mobile type selectively communicating with the switching office through a plurality of radio channels,
each of said terminals comprising: -
receiving means for receiving a system information broadcast from said switching office through a radio control channel, said system information comprising channel state information whether said radio channels are currently idle or busy and which ones of said fixed and mobile terminals currently use the busy channels; and calling means for referring to said channel state information to select, as a particular channel, one of the idle channels, said calling means producing a call setup request including its own terminal information together with said particular channel to send out, as a particular terminal, said call setup request being transmitted to said switching office, said switching office comprising; channel state memory means for storing said channel state information; broadcasting means for broadcasting said system information through said radio control channel; and channel assigning means responsive to said call setup request for assigning said particular channel to said particular terminal to renew said channel state memory means;
whereinsaid system information further comprises terminal data of the maximum number separately predetermined for each of said fixed and mobile types of said terminals assignable to said plurality of radio channels; said calling means referring to said terminal data and said channel state information to compare the maximum number of the type corresponding to its own terminal type as a particular type with the current number of terminals of the type corresponding to said particular type currently using the busy channels, said calling means selecting, as said particular channel, one of current idle channels when said maximum number is larger than said current number; and said switching office further comprises terminal data memory means for storing said terminal data. - View Dependent Claims (7, 8)
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Specification