Method for allocating idle channels of a cellular mobile telephone system for use in a microcellular system
First Claim
1. A method by which a microcellular system (MCS) sharing voice channels in a frequency band allocated to a cellular mobile telephone system (CMTS) selects channels therefrom for allocation to said MCS, said MCS operating in the same area as a local cell of said CMTS to which said CMTS has allocated particular ones of said CMTS voice channels, wherein said MCS performs the steps of:
- (a) repetitively scanning said CMTS voice channels for a scanning time period substantially longer than the duration of any single voice communication with a receiver in said MCS, said scanning including CMTS voice channels not allocated to said local cell, to determine a maximum reception level for each of said CMTS voice channels during said scanning time period;
(b) generating and storing a list of idle voice channels based solely upon information obtained as a result of said scanning, wherein said maximum reception level of each CMTS voice channel on said list is below a predetermined threshold value;
(c) allocating at least one channel from said list to said MCS for use as a MCS control channel; and
(d) allocating channels from said list to said MCS for use as voice channels by said MCS.
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Abstract
In a microcellular system operated in the same frequency band as a cellular system, an interference-free channel is automatically searched and allocated. The microcellular system which shares the frequency band with the cellular system comprises a control unit, a base station and a multi-channel selecting receiver. The multi-channel selecting receiver monitors a use status of cellular channels of the band by repetitively scanning voice channels for a scanning time period substantially longer than the duration of any single voice communication to detect idling channels and allocates them to its own system. Whenever a communication request is issued, the base station detect a channel not used by its own system from the idling channels and allocates it for communication.
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Citations
10 Claims
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1. A method by which a microcellular system (MCS) sharing voice channels in a frequency band allocated to a cellular mobile telephone system (CMTS) selects channels therefrom for allocation to said MCS, said MCS operating in the same area as a local cell of said CMTS to which said CMTS has allocated particular ones of said CMTS voice channels, wherein said MCS performs the steps of:
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(a) repetitively scanning said CMTS voice channels for a scanning time period substantially longer than the duration of any single voice communication with a receiver in said MCS, said scanning including CMTS voice channels not allocated to said local cell, to determine a maximum reception level for each of said CMTS voice channels during said scanning time period; (b) generating and storing a list of idle voice channels based solely upon information obtained as a result of said scanning, wherein said maximum reception level of each CMTS voice channel on said list is below a predetermined threshold value; (c) allocating at least one channel from said list to said MCS for use as a MCS control channel; and (d) allocating channels from said list to said MCS for use as voice channels by said MCS. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A microcellular system (MCS) which shares the voice channels of a frequency band allocated to a cellular module telephone system (CMTS) and which operates in the same area as a local cell of said CMTS to which said CMTS has allocated particular ones of said CMTS voice channels, comprising:
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(a) cellular channel scanning receiver for repetitively scanning said CMTS voice channels, including CMTS voice channels not allocated to said local cell, over a scanning time period substantially longer than the duration of any single voice communication, to identify idle voice channels, based solely on said scanning, having a reception level during said scanning time period that is lower than a predetermined value; a control unit; and means for transmitting to said control unit a list identifying said idle voice channels, said control unit allocating said idle voice channels to said microcellular system or thereafter servicing any communication requests to said MCS. - View Dependent Claims (10)
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Specification