Framing for an adaptive modulation communication system
First Claim
1. A base station for wirelessly communicating with a plurality of subscriber units, the base station comprising:
- a transmitter for transmitting a downlink (DL) frame, the DL frame including;
a) control information including synchronization information for synchronizing the plurality of subscriber units with the base station, information on uplink (UL) scheduled events and downlink scheduled events, identification of UL physical (PHY) modes associated with the UL scheduled events, and identification of DL PHY modes associated with the DL scheduled events, andb) DL data blocks, a DL data block for a first subscriber unit being identified by one of the DL scheduled events,the transmitter being configured to encode the control information according to a most robust DL PHY mode compatible with the plurality of subscriber units and to encode DL data in the DL data block according to the associated DL PHY mode; and
a receiver configured to receive, from a second subscriber unit, in an UL frame, an UL data block with UL data identified by a related UL scheduled event, de-map the UL data from the UL data block, and decode the UL data based on the associated UL PHY mode.
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Accused Products
Abstract
A system and method for mapping a combined frequency division duplexing (FDD) Time Division Multiplexing (TDM)/Time Division Multiple Access (TDMA) downlink subframe for use with half-duplex and full-duplex terminals in a communication system. Embodiments of the downlink subframe vary Forward Error Correction (FEC) types for a given modulation scheme as well as support the implementation of a smart antenna at a base station in the communication system. Embodiments of the system are also used in a TDD communication system to support the implementation of smart antennae. A scheduling algorithm allows TDM and TDMA portions of a downlink to efficiently co-exist in the same downlink subframe and simultaneously support full and half-duplex terminals.
142 Citations
23 Claims
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1. A base station for wirelessly communicating with a plurality of subscriber units, the base station comprising:
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a transmitter for transmitting a downlink (DL) frame, the DL frame including; a) control information including synchronization information for synchronizing the plurality of subscriber units with the base station, information on uplink (UL) scheduled events and downlink scheduled events, identification of UL physical (PHY) modes associated with the UL scheduled events, and identification of DL PHY modes associated with the DL scheduled events, and b) DL data blocks, a DL data block for a first subscriber unit being identified by one of the DL scheduled events, the transmitter being configured to encode the control information according to a most robust DL PHY mode compatible with the plurality of subscriber units and to encode DL data in the DL data block according to the associated DL PHY mode; and a receiver configured to receive, from a second subscriber unit, in an UL frame, an UL data block with UL data identified by a related UL scheduled event, de-map the UL data from the UL data block, and decode the UL data based on the associated UL PHY mode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A base station for establishing wireless communication with a plurality of subscriber units, the base station comprising:
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a transmitter for transmitting a downlink (DL) frame, the DL frame including; a) control information including synchronization information for synchronizing the plurality of subscriber units with the base station, information on uplink (UL) scheduled events and downlink scheduled events, identification of UL physical (PHY) modes associated with the UL scheduled events, and identification of DL PHY modes associated with the DL scheduled events, and b) DL data blocks for first subscriber units, a data block being identified by one of the DL scheduled event, the transmitter being configured to encode the control information and to encode DL data in the DL data block according to the associated DL PHY mode; and a receiver configured to receive in an UL frame, an UL data block with UL data identified by a related UL scheduled event, de-map the UL data from the UL data block, and decode the UL data based on the associated UL PHY mode, wherein the associated DL PHY mode includes a DL modulation format and a DL forward error correction (FEC) coding selected independently of each other, and based on one or more downlink (DL) communication parameters. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method of exchanging data between a base station and a plurality of subscriber units in a point-to-multipoint wireless communication system, where the base station uses adaptive modulation, the method comprising:
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encoding control information including a preamble for synchronizing subscriber units with the base station, information on downlink (DL) scheduled events pertaining to subscriber units scheduled to receive DL data in a frame, and identification of DL physical (PHY) modes associated with the respective DL scheduled events; for a first subscriber unit, encoding DL data in a DL data block according to a DL PHY mode and to the information on a DL scheduled event associated with the DL PHY mode as provided by the control information; and transmitting the encoded control information and the DL data block with the encoded DL data, wherein the DL PHY mode includes a DL modulation format and a DL forward error correction (FEC) coding, the DL modulation format and DL FEC coding being selected independently of each other based on one or more communication parameters of a wireless link established between the base station and the first subscriber unit to which the DL data is addressed. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification