SYSTEMS AND METHODS FOR SUPPORTING ASYNCHRONOUS UPLINK HARQ AND MULTIPLE SIMULTANEOUS TRANSMISSIONS
First Claim
1. A method for uplink data transmission, the method performed by a user equipment (UE), and the method comprising:
- transmitting, to a base station, a first grant free uplink data transmission including a first transport block, wherein the first transport block is associated with a first HARQ process, wherein the first grant-free uplink data transmission includes a first reference signal sequence, and wherein the first grant-free uplink data transmission is sent using first time-frequency resources in an uplink subframe;
transmitting, to the base station, a second grant free uplink data transmission including a second transport block, wherein the second transport block is associated with a second HARQ process, wherein the second grant free uplink data transmission includes a second reference signal sequence, and wherein the second grant free uplink data transmission is sent using second time-frequency resources in the uplink subframe;
decoding first feedback and second feedback received from the base station in a downlink acknowledgement channel, the first feedback representing a first ACK or first NACK for the first transport block, and the second feedback representing a second ACK or a second NACK for the second transport block;
wherein at least one of the first time-frequency resources and first reference signal sequence identifies the first UE and the first HARQ process, and wherein at least one of the second time-frequency resources and the second reference signal sequence identifies the second UE and the second HARQ process.
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Abstract
Current HARQ procedures for grant-based uplink transmissions may not be suitable for implementations in which a UE can simultaneously transmit multiple transport blocks (TBs) to a base station. However, in some scenarios, such as in some grant-free uplink transmission schemes, a UE may simultaneously transmit multiple TBs. Systems and methods are disclosed herein for performing HARQ for situations in which a UE simultaneously transmits multiple TBs to a base station. By using the systems and methods described herein, HARQ may therefore be performed in such situations.
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Citations
20 Claims
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1. A method for uplink data transmission, the method performed by a user equipment (UE), and the method comprising:
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transmitting, to a base station, a first grant free uplink data transmission including a first transport block, wherein the first transport block is associated with a first HARQ process, wherein the first grant-free uplink data transmission includes a first reference signal sequence, and wherein the first grant-free uplink data transmission is sent using first time-frequency resources in an uplink subframe; transmitting, to the base station, a second grant free uplink data transmission including a second transport block, wherein the second transport block is associated with a second HARQ process, wherein the second grant free uplink data transmission includes a second reference signal sequence, and wherein the second grant free uplink data transmission is sent using second time-frequency resources in the uplink subframe; decoding first feedback and second feedback received from the base station in a downlink acknowledgement channel, the first feedback representing a first ACK or first NACK for the first transport block, and the second feedback representing a second ACK or a second NACK for the second transport block; wherein at least one of the first time-frequency resources and first reference signal sequence identifies the first UE and the first HARQ process, and wherein at least one of the second time-frequency resources and the second reference signal sequence identifies the second UE and the second HARQ process. - View Dependent Claims (2, 3, 4, 5)
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6. A user equipment (UE) comprising:
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a transmitter to; transmit, to a base station, a first grant-free uplink data transmission including a first transport block, wherein the first transport block is associated with a first HARQ process, wherein the first grant-free uplink data transmission includes a first reference signal sequence, and wherein the first grant-free uplink data transmission is sent using first time-frequency resources in an uplink subframe; and transmit, to the base station, a second grant-free uplink data transmission including a second transport block, wherein the second transport block is associated with a second HARQ process, wherein the second grant-free uplink data transmission includes a second reference signal sequence, and wherein the second grant-free uplink data transmission is sent using second time-frequency resources in the uplink subframe; a receiver to receive first feedback and second feedback from the base station in a downlink acknowledgement channel, the first feedback representing a first ACK or first NACK for the first transport block, and the second feedback representing a second ACK or a second NACK for the second transport block; a decoder to decode the first feedback and the second feedback; wherein at least one of the first time-frequency resources and first reference signal sequence identifies the first UE and the first HARQ process, and wherein at least one of the second time-frequency resources and the second reference signal sequence identifies the second UE and the second HARQ process. - View Dependent Claims (7, 8, 9, 10)
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11. A method performed by a base station, the method comprising:
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receiving, from a user equipment (UE), a first grant-free uplink data transmission including a first transport block, wherein the first transport block is associated with a first HARQ process, wherein the first grant-free uplink data transmission includes a first reference signal sequence, and wherein the first grant-free uplink data transmission is received using first time-frequency resources in an uplink subframe; receiving, from the UE, a second grant-free uplink data transmission including a second transport block, wherein the second transport block is associated with a second HARQ process, wherein the second grant-free uplink data transmission includes a second reference signal sequence, and wherein the second grant-free uplink data transmission is received using second time-frequency resources in the uplink subframe; decoding the first transport block and generating first feedback representing a first ACK or first NACK for the first transport block; decoding the second transport block and generating second feedback representing a second ACK or second NACK for the second transport block; transmitting, to the UE, the first feedback and the second feedback in a downlink acknowledgement channel; wherein at least one of the first time-frequency resources and first reference signal sequence identifies the first UE and the first HARQ process, and wherein at least one of the second time-frequency resources and the second reference signal sequence identifies the second UE and the second HARQ process. - View Dependent Claims (12, 13, 14, 15)
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16. A base station comprising:
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a receiver to; receive, from a user equipment (UE), a first grant-free uplink data transmission including a first transport block, wherein the first transport block is associated with a first HARQ process, wherein the first grant-free uplink data transmission includes a first reference signal sequence, and wherein the first grant-free uplink data transmission is received using first time-frequency resources in an uplink subframe; receive, from the UE, a second grant-free uplink data transmission including a second transport block, wherein the second transport block is associated with a second HARQ process, wherein the second grant-free uplink data transmission includes a second reference signal sequence, and wherein the second grant-free uplink data transmission is received using second time-frequency resources in the uplink subframe; a decoder to; decode the first transport block and generate first feedback representing a first ACK or first NACK for the first transport block; decode the second transport block and generate second feedback representing a second ACK or second NACK for the second transport block; a transmitter to transmit, to the UE, the first feedback and the second feedback in a downlink acknowledgement channel; wherein at least one of the first time-frequency resources and first reference signal sequence identifies the first UE and the first HARQ process, and wherein at least one of the second time-frequency resources and the second reference signal sequence identifies the second UE and the second HARQ process. - View Dependent Claims (17, 18, 19, 20)
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Specification