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US 10,651,980 B2Granted
HARQ systems and methods for grant-free uplink transmissions
AssigneeHuawei Technologies Co., Ltd.
InventorsYu Cao, Liqing Zhang
Life of this patent
Estimating the term…
Abstract
Systems and methods are disclosed for performing hybrid automatic repeat request (HARQ) for grant-free uplink transmissions. Some of the systems and methods disclosed herein may address problems such as how to perform acknowledgement (ACK) and/or negative acknowledgement (NACK), how to determine and signal retransmission timing, how to determine the transmission/retransmission attempt and the redundancy version (RV), and/or how to perform the HARQ combining.
Claims20
A method for transmitting uplink data, comprising:
- receiving, by a user equipment (UE), a resource configuration for K grant-free uplink transmissions of a data packet, wherein the resource configuration configures K uplink time-frequency resources for the K grant-free uplink transmissions;
- performing, by the UE, an initial grant-free uplink transmission of a data packet on one of the K uplink time-frequency resources;
- and performing, by the UE, a grant-free retransmission of the data packet on an uplink time-frequency resource among the K uplink time-frequency resources, until a scheduling grant for a retransmission of the data packet is received before a time domain location of a last uplink time-frequency resource of the K uplink time-frequency resources for the K grant-free uplink transmissions;
- wherein the grant-free retransmission is performed without waiting for acknowledgement/negative acknowledgement (ACK/NACK) feedback for a transmission of the data packet.
1 more element
A user equipment (UE) comprising:
- at least one antenna;
- and
- a grant-free transmission module configured to:
- receive, via the at least one antenna, a resource configuration for K grant-free uplink transmissions of a data packet, wherein the resource configuration configures K uplink time-frequency resources for the K grant-free uplink transmissions;
- perform an initial grant-free uplink transmission of a data packet on one of the K uplink time-frequency resources;
- and
- perform a grant-free retransmission of the data packet on an uplink time-frequency resource among the K uplink time-frequency resources, until a scheduling grant for a retransmission of the data packet is received before a time domain location of a last uplink time-frequency resource of the K uplink time-frequency resources for the K grant-free uplink transmissions;
- wherein the grant-free transmission module is configured to perform the grant-free retransmission without waiting for acknowledgement/negative acknowledgement (ACK/NACK) feedback for a transmission of the data packet.
5 more elements
A method, comprising:
- transmitting, by a base station to a user equipment (UE), a resource configuration for K grant-free uplink transmissions of a data packet, wherein the resource configuration configures K uplink time-frequency resources for the K grant-free uplink transmissions:
- receiving, by the base station, an initial grant-free uplink transmission of a data packet on one of the K uplink time-frequency resources:
- and
- receiving, by the base station, a grant-free retransmission of the data packet on uplink time-frequency resources among the K uplink time-frequency resources, until a scheduling grant for a retransmission of the data packet is sent by the base station before a time domain location of a last uplink time-frequency resource of the K uplink time-frequency resources for the K grant-free uplink transmissions:
- wherein the grant-free retransmission is received without the base station transmitting acknowledgement/negative acknowledgement (ACK/NACK) feedback for the data packet.
2 more elements
A base station, comprising:
- at least one antenna:
- and
- a grant-free transmission module configured to:
- transmit, to a user equipment (UE) via the at least one antenna, a resource configuration for K grant-free uplink transmissions of a data packet, wherein the resource configuration configures K uplink time-frequency resources for the K grant-free uplink transmissions:
- receive an initial grant-free uplink transmission of a data packet on one of the K uplink time-frequency resources:
- and
- receive a grant-free retransmission of the data packet on uplink time-frequency resources among the K uplink time-frequency resources, until a scheduling grant for a retransmission of the data packet is sent by the base station before a time domain location of a last uplink time-frequency resource of the K uplink time-frequency resources for the K grant-free uplink transmissions:
- wherein the grant-free transmission module is configured to receive the grant-free retransmission without transmitting acknowledgement/negative acknowledgement (ACK/NACK) feedback for the data packet.
5 more elements
Dependencies are inferred from the claim text.