METHOD AND APPARATUS FOR TIME DIVISION LTE TRANSMISSION IN UNLICENSED RADIO FREQUENCY BANDS
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Abstract
Apparatus and methods for time division based communication between a wireless device and a wireless network in a licensed radio frequency (RF) band and an unlicensed RF band are disclosed. The wireless device receives downlink control information (DCI), via a primary component carrier (PCC) of a primary cell (Pcell) in the licensed RF band, indicating downlink (DL) data transmission via a secondary component carrier (SCC) of a secondary cell (Scell) in the unlicensed RF band. The wireless device receives via the SCC part of the DL data transmission and transmits a control message via the PCC in response. The wireless device sends a scheduling request (SR) to the eNodeB and receives uplink (UL) transmission opportunities in a combination of the licensed RF band and the unlicensed RF band. The wireless device performs a clear channel assessment before reserving and transmitting to the eNodeB in the unlicensed RF band.
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Citations
21 Claims
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1. (canceled)
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2. A method for communication in an unlicensed radio frequency (RF) band, the method comprising:
by a wireless network apparatus of a wireless network; receiving, from a wireless communication device via a primary component carrier (PCC) in a licensed RF band, a scheduling request (SR) message indicating pending uplink (UL) data; transmitting, to the wireless communication device via the PCC in the licensed RF band, downlink control information (DCI) indicating a plurality of UL transmission opportunities via a secondary component carrier (SCC) in the unlicensed RF band; and transmitting, to the wireless communication device via the PCC in the licensed RF band after all of the plurality of UL transmission opportunities have occurred, a control message comprising a bundled set of hybrid automatic repeat request (HARQ) acknowledgement (ACK) and negative acknowledgement (NACK) messages corresponding to the plurality of UL transmission opportunities. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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9. A method for communication in an unlicensed radio frequency (RF) band, the method comprising:
by a wireless communication device; transmitting, to an eNodeB of a wireless network via a primary component carrier (PCC) in a licensed RF band, a scheduling request (SR) message indicating pending uplink (UL) data; receiving, from the eNodeB via the PCC in the licensed RF band, downlink control information (DCI) indicating a plurality of UL transmission opportunities via a secondary component carrier (SCC) in the unlicensed RF band; performing a clear channel assessment (CCA) for at least a portion of the unlicensed RF band during one of the plurality of UL transmission opportunities; transmitting, to the eNodeB via the SCC in the unlicensed RF band, at least a portion of the pending UL data, when the CCA indicates that the at least a portion of the unlicensed RF band is available for transmission; repeating the CCA for the at least a portion of the unlicensed RF band during a second one of the plurality of UL transmission opportunities after waiting for a back-off time period, when the CCA indicates that the at least a portion of the unlicensed RF band is not available for transmission during the one of the plurality of UL transmission opportunities; and transmitting, to the eNodeB via the SCC in the unlicensed RF band, at least a portion of the pending UL data, when the CCA indicates that the at least a portion of the unlicensed RF band is available for transmission during the second one of the plurality of UL transmission opportunities. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus configurable for operation in a wireless communication device, the apparatus comprising:
processing circuitry including a processor and a memory storing instructions that, when executed by the processor, cause the wireless communication device to; transmit, to an eNodeB of a wireless network via a primary component carrier (PCC) in a licensed radio frequency (RF) band, a scheduling request (SR) message indicating pending uplink (UL) data; receive, from the eNodeB via the PCC in the licensed RF band, downlink control information (DCI) indicating a plurality of UL transmission opportunities via a secondary component carrier (SCC) in an unlicensed RF band; perform a clear channel assessment (CCA) for at least a portion of the unlicensed RF band during one of the plurality of UL transmission opportunities; transmit, to the eNodeB via the SCC in the unlicensed RF band, at least a portion of the pending UL data, when the CCA indicates that the at least a portion of the unlicensed RF band is available for transmission; repeat the CCA for the at least a portion of the unlicensed RF band during a second one of the plurality of UL transmission opportunities after waiting for a back-off time period, when the CCA indicates that the at least a portion of the unlicensed RF band is not available for transmission during the one of the plurality of UL transmission opportunities; and transmit, to the eNodeB via the SCC in the unlicensed RF band, at least a portion of the pending UL data, when the CCA indicates that the at least a portion of the unlicensed RF band is available for transmission during the second one of the plurality of UL transmission opportunities. - View Dependent Claims (21)
Specification