System for statistically multiplexing real-time and non-real-time voice and data traffic in a wireless system
First Claim
1. A frequency division duplex point-to-multipoint communications system that divides a frequency allocation into two bands, a downlink band that carries communications from a central station to multiple stations, and an uplink band that carries communications from multiple stations to the central station, the system comprising:
- a carrier generator generating a plurality of carriers within each of said bands, each of said carriers being in a spaced relationship to the other carriers such that each said band is sub-divided into a plurality of sub-bands that are equal in number to the plurality of carriers and each of said plurality of sub-bands having a respective carrier of said plurality of carriers,a time multiplexer dividing each of said sub-bands by time-multiplexing the sub-bands into a plurality of frames,said time multiplexer also dividing each frame into N time-slots, anda switching device assigning a series of time-slots that occur periodically, every N time-slots, once per frame, to form channels for communication between said central station and said multiple stationswherein control is mapped to unidirectional channels and control channel messages are transmitted in one burst via said unidirectional channels in the downlink band to a first station, the control channel messages including assignment of uplink time slots to be used by the first station.
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Accused Products
Abstract
A system for providing statistical multiplexing of speech, other real-time data services and non-real-time data services for point to point and point to multipoint communications. The system has fast access and assignment procedures that allow the multiplexing of real-time, delay-critical data services with non-real-time data services. Continuity of periodic control channels across speech talkspurt and silence periods for conversational voice is maintained to carry signal measurement reports, channel quality feedback, and “comfort” noise information between different parts of the system.
104 Citations
20 Claims
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1. A frequency division duplex point-to-multipoint communications system that divides a frequency allocation into two bands, a downlink band that carries communications from a central station to multiple stations, and an uplink band that carries communications from multiple stations to the central station, the system comprising:
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a carrier generator generating a plurality of carriers within each of said bands, each of said carriers being in a spaced relationship to the other carriers such that each said band is sub-divided into a plurality of sub-bands that are equal in number to the plurality of carriers and each of said plurality of sub-bands having a respective carrier of said plurality of carriers, a time multiplexer dividing each of said sub-bands by time-multiplexing the sub-bands into a plurality of frames, said time multiplexer also dividing each frame into N time-slots, and a switching device assigning a series of time-slots that occur periodically, every N time-slots, once per frame, to form channels for communication between said central station and said multiple stations wherein control is mapped to unidirectional channels and control channel messages are transmitted in one burst via said unidirectional channels in the downlink band to a first station, the control channel messages including assignment of uplink time slots to be used by the first station.
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2. A frequency division duplex point-to-multipoint communications system that divides a frequency allocation into two bands, a downlink band that carries communications from a central station to multiple stations, and an uplink band that carries communications from multiple stations to the central station, the system comprising:
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a carrier generator generating a plurality of carriers within each of said bands, each of said carriers being in a spaced relationship to the other carriers such that each said band is sub-divided into a plurality of sub-bands that are equal in number to the plurality of carriers and each of said plurality of sub-bands having a respective carrier of said plurality of carriers, a time multiplexer dividing each of said sub-bands by time-multiplexing the sub-bands into a plurality of frames, said time multiplexer also dividing each frame into N time-slots, and a switching device assigning a series of time-slots that occur periodically, every N time-slots, once per frame, to form channels for communication between said central station and said multiple stations, wherein traffic is mapped to unidirectional channels and wherein the assignment of uplink carriers and time slots for a first station is done through control messages that are received and processed only by the first station to which the uplink traffic channels are to be assigned. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification