Wireless communication methods, systems, and signal structures
First Claim
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1. A method of transmitting a time division duplexing (TDD) frame structure of a transmission signal from a transmitter to a receiver, the method comprising:
- defining, by a network element in a communication network, a plurality of time slots each comprising at least two orthogonal frequency division multiplexing (OFDM) symbols;
defining, by the network element, at least one fixed switching point within the frame structure;
defining, by the network element, at least one flexible switching point within the frame structure, wherein at each fixed switching point within the frame structure, a predetermined one of uplink or downlink transmission is performed; and
at each flexible switching point within the frame structure, a direction of communications is optionally switched.
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Abstract
Systems and methods for performing OFDM MIMO communications are provided. These include a frame structure; methods of combining various types of MIMO such as STTD and SM; sub-channel definitions; sub-FFT channel constructions; fast control channels; additional modulations; and group antenna transmit diversity; new incremental redundancy schemes.
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Citations
18 Claims
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1. A method of transmitting a time division duplexing (TDD) frame structure of a transmission signal from a transmitter to a receiver, the method comprising:
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defining, by a network element in a communication network, a plurality of time slots each comprising at least two orthogonal frequency division multiplexing (OFDM) symbols; defining, by the network element, at least one fixed switching point within the frame structure; defining, by the network element, at least one flexible switching point within the frame structure, wherein at each fixed switching point within the frame structure, a predetermined one of uplink or downlink transmission is performed; and at each flexible switching point within the frame structure, a direction of communications is optionally switched. - View Dependent Claims (2, 3, 4, 5)
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6. A method of transmitting a time division duplexing (TDD) frame structure of a transmission signal from a transmitter to a receiver, the method comprising:
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defining, by a network element in a communication network, a plurality of TDD slots each comprising at least two orthogonal frequency division multiplexing (OFDM) symbols; at TDD slot boundaries, defining, by the network element, at least one fixed switching point within the frame structure and at least one flexible switching point within the frame structure; wherein at each fixed switching point within the frame structure, a predetermined one of uplink or downlink transmission is performed; wherein at each flexible switching point within the frame structure, uplink or downlink transmission can be scheduled; and wherein the fixed switching point(s) are common across a network, and the flexible switching point(s) are selected on a cell/beam specific basis. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of transmitting a signal from a transmitter to a receiver, the method comprising:
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defining, by a network element in a communication network, time division duplexing (TDD) slots each comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols for traffic and a tail symbol; for at least some slots, using, by the network element, the tail symbol as a transmit/receive transmission guard (TTG) or receive/transmit transition guard (RTG) to facilitate switching between uplink and downlink transmission or vice versa; allocating, by the network element, the tail symbol for traffic for at least one slot during which there is to be no switch between uplink and downlink transmission or vice versa. - View Dependent Claims (18)
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Specification