Method and apparatus for scheduling user equipment uplink transmissions on an unlicensed carrier
First Claim
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1. A method in a user equipment, the method comprising:
- communicating with a base station on a carrier;
receiving an uplink grant from the base station for physical uplink shared channel transmission, where the uplink grant includes a field indicating at least whether an initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol is reserved for a sounding reference signal in a subframe;
performing listen before talk to determine whether the subframe is available for uplink transmission in response to receiving the uplink grant;
transmitting a sounding reference signal in the initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol of the subframe if listen before talk indicates that the subframe is available and the uplink grant field indicates that the symbol is reserved for a sounding reference signal in the subframe; and
transmitting physical uplink shared channel in at least a portion of a remaining part of the subframe, where the remaining part of the subframe occurs later than the initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol.
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Abstract
A method and apparatus schedule user equipment uplink transmissions on an unlicensed carrier. Listen before talk can be performed to determine when a subframe is available for uplink transmission. A sounding reference signal can be transmitted in an initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol of the subframe when listen before talk indicates that the subframe is available. A physical uplink shared channel can be transmitted in at least a portion of a remaining part of the subframe.
35 Citations
18 Claims
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1. A method in a user equipment, the method comprising:
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communicating with a base station on a carrier; receiving an uplink grant from the base station for physical uplink shared channel transmission, where the uplink grant includes a field indicating at least whether an initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol is reserved for a sounding reference signal in a subframe; performing listen before talk to determine whether the subframe is available for uplink transmission in response to receiving the uplink grant; transmitting a sounding reference signal in the initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol of the subframe if listen before talk indicates that the subframe is available and the uplink grant field indicates that the symbol is reserved for a sounding reference signal in the subframe; and transmitting physical uplink shared channel in at least a portion of a remaining part of the subframe, where the remaining part of the subframe occurs later than the initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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a transceiver that communicates with a base station on a carrier, and receives an uplink grant from the base station for physical uplink shared channel transmission, where the uplink grant includes a field indicating at least whether an initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol is reserved for a sounding reference signal in a subframe; a controller coupled to the transceiver, where the controller performs listen before talk to determine whether the subframe is available for uplink transmission in response to receiving the uplink grant; and wherein the transceiver transmits a sounding reference signal in the initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol of the subframe if listen before talk indicates that the subframe is available and the uplink grant field indicates that the symbol is reserved for a sounding reference signal in the subframe, and transmits physical uplink shared channel in at least a portion of a remaining part of the subframe, where the remaining part of the subframe occurs later than the initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method in a user equipment, the method comprising:
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communicating with a base station on a carrier; receiving an uplink grant from the base station for physical uplink shared channel transmission, where the uplink grant includes a field indicating at least whether an initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol is reserved for a sounding reference signal in a subframe; performing listen before talk in response to receiving the uplink grant to determine whether the subframe is available for uplink transmission; transmitting a sounding reference signal in the initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol of the subframe if listen before talk indicates that the subframe is available and the uplink grant field indicates that the symbol is reserved for a sounding reference signal in the subframe; and transmitting physical uplink shared channel in at least a portion of a remaining part of the subframe, where the portion of the remaining part of the subframe excludes at least the last discrete Fourier transform spread orthogonal frequency division multiplexing symbol of the subframe, where the remaining part of the subframe occurs later than the initial discrete Fourier transform spread orthogonal frequency division multiplexing symbol. - View Dependent Claims (18)
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Specification