Method and apparatus to improve PSTN access to wireless subscribers using a low bit rate system
First Claim
1. A method of cellular communication among a subscriber unit, a base station and a switch controller comprising the steps of:
- digitally encoding communications signals in the subscriber unit;
generating radio forward error correction (FEC) in the subscriber unit to protect the encoded communications signals during transmission;
transmitting the encoded communications signals together with the radio FEC by radio from the subscriber unit to the base station;
error correcting the transmitted encoded communications signals in the base station using the radio FEC;
generating wire FEC in the base station to protect the encoded communications signals during transmission;
transmitting the encoded communications signals together with the wire FEC from the base station to the controller;
error correcting the transmitted encoded communications signals in the controller using the wire FEC; and
decoding the digitally encoded communications signals at the controller.
5 Assignments
0 Petitions
Accused Products
Abstract
A method of cellular communication among a subscriber unit, a base station and a switch controller is provided which comprises the steps of digitally encoding speech signals at the subscriber unit; generating radio forward error correction (FEC) at the subscriber unit to protect the encoded speech signals during transmission; transmitting the encoded speech signals together with the radio FEC by radio from the subscriber unit to the base station; error correcting the transmitted encoded speech signals at the base station using the radio FEC; generating wire FEC to protect the encoded speech signals during transmission; transmitting the encoded speech signals together with the wire FEC from the base station to the controller; error correcting the transmitted encoded speech signals at the controller using the wire FEC; and decoding the digitally encoded speech signals at the controller.
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Citations
26 Claims
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1. A method of cellular communication among a subscriber unit, a base station and a switch controller comprising the steps of:
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digitally encoding communications signals in the subscriber unit; generating radio forward error correction (FEC) in the subscriber unit to protect the encoded communications signals during transmission; transmitting the encoded communications signals together with the radio FEC by radio from the subscriber unit to the base station; error correcting the transmitted encoded communications signals in the base station using the radio FEC; generating wire FEC in the base station to protect the encoded communications signals during transmission; transmitting the encoded communications signals together with the wire FEC from the base station to the controller; error correcting the transmitted encoded communications signals in the controller using the wire FEC; and decoding the digitally encoded communications signals at the controller. - View Dependent Claims (2, 3, 4, 5)
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6. A method of cellular communication among a subscriber unit, a base station and a switch controller comprising the steps of:
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digitally encoding communications signals in the controller; generating wire forward error correction (FEC) in the controller to protect the encoded communications signals during transmission; transmitting the encoded communications signals together with the wire FEC from the controller to the base station; error correcting the transmitted encoded communications signals in the base station using the wire FEC; generating radio FEC in the base station to protect the encoded communications signals during transmission; transmitting the encoded communications signals together with the radio FEC by radio from the base station to the subscriber unit; error correcting the transmitted encoded communications signals in the subscriber unit using the radio FEC; and decoding the digitally encoded communications signals in the subscriber unit. - View Dependent Claims (7, 8, 9, 10)
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11. A cellular telephone communications base station comprising:
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a digital radio; a switch controller interface device; first means for decoding radio Forward Error Correction (FEC) for first communication signals received by the digital radio; second means for encoding such first communication signals with wire FEC prior to provision to the switch controller interface device; third means for decoding wire FEC for second communication signals received by the switch controller interface device; and fourth means for encoding such second communication signals with radio FEC prior to provision to the digital radio. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A cellular telephone communications base station comprising:
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multiple digital radios; a switch controller interface device; multiple base station channels, each channel including, first means for decoding radio Forward Error Correction (FEC) for first communication signals received by a digital radio, second means for encoding wire FEC for such first communication signals, and third means for decoding wire FEC for second communication signals received by the switch controller interface device, fourth means for encoding radio FEC for such second communication signals; and multiplexing circuitry that directs communication signals between the multiple base station channels and the switch controller interface device. - View Dependent Claims (20, 21, 22, 23)
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24. A cellular telephone communications base station comprising:
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multiple digital radios; a switch controller interface device; multiple respective base station channels coupled to transfer communication signals to and from respective digital radios, each respective channel including digital signal processing circuitry programmed to, decode radio Forward Error Correction (FEC) for first communication signals received by the digital radio and to immediately encode wire FEC for such first communication signals to prepare the first communication signals for provision to the switch controller interface device, and decode wire FEC for second communication signals received by the switch controller interface device and to immediately encode radio FEC for such second received communication signals to prepare the second communication signals for provision to a respective digital radio; multiplexing circuitry that directs communication signals between the multiple base station channels and the switch controller interface device; and an antenna assembly connected to the multiple digital radios.
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25. A system for wireless local loop communications with the public switched telephone network (PSTN) comprising:
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A. a subscriber unit which includes, a digital subscriber unit radio, a subscriber unit coder device which compresses and decompresses digital communication signals, a radio forward Error Correction (FEC) device which encodes radio FEC for first compressed communication signals that have been compressed by the subscriber unit coder device prior to transmission by the digital subscriber unit radio and which decodes radio FEC for second compressed communication signals received by the digital subscriber unit radio prior to provision of the second compressed digital signals to the subscriber unit coder device for decompression, and a telephone interface for transmitting decompressed communication signals to and from the coder device; B. a base station which includes, multiple digital base station radios, a switch controller interface device, multiple base station channels, each including, first base station means for decoding radio FEC for first compressed communication signals received by a digital base station radio, second base station means for encoding wire FEC for such first compressed communication signals prior to provision of the first compressed communication signals to the switch controller interface device, third base station means for decoding wire FEC for second compressed communication signals received through the switch controller interface device, fourth base station means for encoding radio FEC for such second compressed communication signals prior to provision of the second compressed communication signals to a digital base station radio, base station multiplexing circuitry that directs compressed communication signals between the multiple base station channels and the switch controller interface device, an antenna assembly connected to the multiple base station radios; and C. a switch controller which includes, a base station interface device, a controller coder device which compresses and decompresses digital communication signals; multiple controller channels, each including, a wire FEC device which decodes wire FEC for first compressed communication signals received through the base station interface device prior to provision of the first compressed communication signals to the controller coder device for decompression, and which encodes wire FEC for second compressed communication signals that have been compressed by the controller coder device, first controller multiplexing circuitry that directs compressed communication signals between the multiple controller channels and the base station interface device, and second controller multiplexing circuitry that directs decompressed communication signals between the multiple controller channels and the PSTN. - View Dependent Claims (26)
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Specification