HARQ signaling for grant-free uplink transmissions
First Claim
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1. A method performed by a base station comprising:
- receiving a first grant-free uplink transmission from a first user equipment (UE);
receiving a second grant-free uplink transmission from a second UE;
transmitting, to the first UE and to the second UE, a group ACK/NACK message indicating an ACK or a NACK corresponding to the first grant-free uplink transmission and an ACK or a NACK corresponding to the second grant-free uplink transmission;
wherein the first UE and the second UE are in a group having a group ID, wherein the group ACK/NACK is associated with the group ID, wherein the group ACK/NACK is transmitted in group-common downlink control information (DCI), and wherein a cyclic redundancy check (CRC) of the group-common DCI is masked by the group ID.
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Abstract
In a wireless communication system, a grant-free uplink transmission is an uplink transmission sent from a user equipment (UE) to a base station that does not need a dynamic and explicit scheduling grant from the base station. Systems and methods are disclosed for performing hybrid automatic repeat request (HARQ) for grant-free uplink transmissions. Signaling relating to the ACK/NACK for the HARQ, as well as signaling relating to configuring the UE for grant-free uplink transmission, is also disclosed.
34 Citations
26 Claims
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1. A method performed by a base station comprising:
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receiving a first grant-free uplink transmission from a first user equipment (UE); receiving a second grant-free uplink transmission from a second UE; transmitting, to the first UE and to the second UE, a group ACK/NACK message indicating an ACK or a NACK corresponding to the first grant-free uplink transmission and an ACK or a NACK corresponding to the second grant-free uplink transmission; wherein the first UE and the second UE are in a group having a group ID, wherein the group ACK/NACK is associated with the group ID, wherein the group ACK/NACK is transmitted in group-common downlink control information (DCI), and wherein a cyclic redundancy check (CRC) of the group-common DCI is masked by the group ID. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A base station comprising:
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a receiver to receive a first grant-free uplink transmission from a first user equipment (UE), and to receive a second grant-free uplink transmission from a second UE; a grant-free transmission module to generate a group ACK/NACK message that indicates an ACK or a NACK corresponding to the first grant-free uplink transmission and an ACK or a NACK corresponding to the second grant-free uplink transmission; wherein the first UE and the second UE are in a group having a group ID, wherein the group ACK/NACK is associated with the group ID, wherein the base station is to transmit the group ACK/NACK in group-common downlink control information (DCI) and to mask a cyclic redundancy check (CRC) of the group-common DCI by the group ID. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method performed by a first user equipment (UE) comprising:
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transmitting a first grant-free uplink transmission to a base station; receiving a group ACK/NACK message indicating an ACK or a NACK corresponding to the first grant-free uplink transmission and an ACK or a NACK corresponding to a second grant-free uplink transmission from a second UE; wherein the first UE shares a group with the second UE, the group having a group ID, wherein the group ACK/NACK is associated with the group ID, wherein the group ACK/NACK is received in group-common downlink control information (DCI), and wherein a cyclic redundancy check (CRC) of the group-common DCI is masked by the group ID. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A first user equipment (UE) comprising:
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a transmitter to transmit a first grant-free uplink transmission to a base station; a receiver to receive a group ACK/NACK message that indicates an ACK or a NACK corresponding to the first grant-free uplink transmission and an ACK or a NACK corresponding to a second grant-free uplink transmission from a second UE; wherein the first UE shares a group with the second UE, the group having a group ID, wherein the group ACK/NACK is associated with the group ID, wherein the group ACK/NACK is received in group-common downlink control information (DCI), and wherein a cyclic redundancy check (CRC) of the group-common DCI is masked by the group ID. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification