Overload control in a packet-switching cellular environment
First Claim
1. A method for operating a cellular system comprising a base station that receives voice packets representing speech of a given fidelity from at least one of a plurality of mobile units that transmits the voice packets to the base station, comprising the steps of:
- said base station determining an overload condition on an inbound frequency over which mobile units transmit said voice packets to the base station, and in response to a determination of an overload condition, the base station directing said at least one mobile unit to transmit voice packets that correspond to a portion of said speech, which portion corresponds to speech that is intelligible but with a fidelity that is lower than said given fidelity.
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Abstract
An improved cellular arrangement is created with mobile units that are responsive to control signals that direct the mobile units to modify the rate of packet transmissions in case of channel overload. A mobile unit in such an arrangement encodes either the speech signal, or only a portion thereof that is sufficient to reproduce a lower fidelity speech which is still intelligible—and at a lower rate. In another embodiment, the mobile unit creates a second stream of packets, also at a lower rate. The second stream complements the first stream of packets in its lower rate form, to allow reproducing the speech signal with high fidelity. Operationally, such a mobile unit is responsive to a base station which, under overload conditions, directs the mobile unit to transmit packets at the lower rate (and the lower fidelity). Optionally, the base station can also directs the mobile unit to send the second stream of packets over a different channel.
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Citations
7 Claims
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1. A method for operating a cellular system comprising a base station that receives voice packets representing speech of a given fidelity from at least one of a plurality of mobile units that transmits the voice packets to the base station, comprising the steps of:
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said base station determining an overload condition on an inbound frequency over which mobile units transmit said voice packets to the base station, and in response to a determination of an overload condition, the base station directing said at least one mobile unit to transmit voice packets that correspond to a portion of said speech, which portion corresponds to speech that is intelligible but with a fidelity that is lower than said given fidelity. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification