System and method for transmission in a grant-free uplink transmission scheme
First Claim
1. A method comprising:
- obtaining, by a first reliable ultra-low latency user equipment (RULL-UE), a first contention transmission unit (CTU) for an initial transmission in a first transmission time interval (TTI);
transmitting, by the first RULL-UE, to a base station (BS), the initial transmission on the first CTU during the first TTI;
obtaining, by the first RULL-UE, a second CTU for a redundant transmission in a second TTI subsequent to the first TTI; and
transmitting, to the BS, the redundant transmission on the second CTU during the second TTI without receiving acknowledgement/negative acknowledgement (ACK/NACK) feedback from the BS;
wherein the first CTU and the second CTU are basic transmission resources in a grant-free uplink transmission scheme, the grant-free uplink transmission scheme has a predefined initial pattern and a regrouped pattern, wherein the initial pattern has a mapping between a first group of RULL-UEs and a first group of CTUs for initial transmissions in the first TTI, and the regrouped pattern has a mapping between at least one UE of the first group of RULL-UEs and a second group of CTUs for redundant transmission in the second TTI.
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Abstract
A system and method includes implementing, by a base station (BS), a reliable ultra-low latency transmission mechanism in a grant-free uplink transmission scheme having defined therein contention transmission unit (CTU) access regions and a plurality of CTUs. Implementing the reliable ultra-low latency transmission mechanism includes defining a reliable ultra-low latency CTU (RULL-CTU) access region from a portion of the CTU access regions of the grant-free transmission scheme, defining an RULL-CTU mapping scheme by mapping at least a portion of plurality of CTUs to the RULL-CTU access region to define a plurality of RULL-CTUs, defining a reliable ultra-low latency user equipment (RULL-UE) mapping scheme by defining rules for mapping a plurality of RULL-UEs to the plurality of RULL-CTUs in an initial pattern for initial transmissions in a first transmission time interval (TTI), and a regrouped pattern for redundant transmissions in a second TTI subsequent to the first TTI.
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Citations
40 Claims
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1. A method comprising:
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obtaining, by a first reliable ultra-low latency user equipment (RULL-UE), a first contention transmission unit (CTU) for an initial transmission in a first transmission time interval (TTI); transmitting, by the first RULL-UE, to a base station (BS), the initial transmission on the first CTU during the first TTI; obtaining, by the first RULL-UE, a second CTU for a redundant transmission in a second TTI subsequent to the first TTI; and transmitting, to the BS, the redundant transmission on the second CTU during the second TTI without receiving acknowledgement/negative acknowledgement (ACK/NACK) feedback from the BS; wherein the first CTU and the second CTU are basic transmission resources in a grant-free uplink transmission scheme, the grant-free uplink transmission scheme has a predefined initial pattern and a regrouped pattern, wherein the initial pattern has a mapping between a first group of RULL-UEs and a first group of CTUs for initial transmissions in the first TTI, and the regrouped pattern has a mapping between at least one UE of the first group of RULL-UEs and a second group of CTUs for redundant transmission in the second TTI. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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2. A first reliable ultra-low latency user equipment (RULL-UE) comprising:
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a hardware processor; and a computer readable storage medium having stored thereon computer readable code for execution by the processor to cause the first RULL-UE to; obtain a first contention transmission unit (CTU) for an initial transmission in a first transmission time interval (TTI); transmit, to a base station (BS), the initial transmission on the first CTU during the first TTI; obtain a second CTU for a redundant transmission in a second TTI subsequent to the first TTI; and transmit, to the BS, the redundant transmission on the second CTU during the second TTI without receiving acknowledgement/negative acknowledgement (ACK/NACK) feedback from the BS; wherein the first CTU and the second CTU are basic transmission resources in a grant-free uplink transmission scheme, the grant-free uplink transmission scheme has a predefined initial pattern and a regrouped pattern, wherein the initial pattern has a mapping between a first group of RULL-UEs and a first group of CTUs for initial transmissions in the first TTI, and the regrouped pattern has a mapping between at least one UE of the first group of RULL-UEs and a second group of CTUs for redundant transmission in the second TTI. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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3. A method comprising:
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receiving, by a base station (BS), an initial transmission on a first contention transmission unit (CTU) during a first transmission time interval (TTI) from a first reliable ultra-low latency user equipment (RULL-UE); and receiving, by the BS, a redundant transmission on a second CTU during a second TTI from the first RULL-UE without sending acknowledgement/negative acknowledgement (ACK/NACK) feedback to the RULL-UE; wherein the first CTU and the second CTU are basic transmission resources in a grant-free uplink transmission scheme, the grant-free uplink transmission scheme has a predefined initial pattern and a regrouped pattern, wherein the initial pattern has a mapping between a first group of RULL-UEs and a first group of CTUs for the initial transmissions in the first TTI, and the regrouped pattern has a mapping between at least one UE of the first group of RULL-UEs and a second group of CTUs for the redundant transmission in the second TTI. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A base station (BS) comprising:
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a hardware processor; and a computer readable storage medium having stored thereon computer readable code for execution by the processor to cause the BS to; receive an initial transmission on a first contention transmission unit (CTU) during a first transmission time interval (TTI) from a first reliable ultra-low latency user equipment (RULL-UE); and receive a redundant transmission on a second CTU during a second TTI from the first RULL-UE without sending acknowledgement/negative acknowledgement (ACK/NACK) feedback to the RULL-UE; wherein the first CTU and the second CTU are basic transmission resources in a grant-free uplink transmission scheme, the grant-free uplink transmission scheme has a predefined initial pattern and a regrouped pattern, wherein the initial pattern has a mapping between a first group of RULL-UEs and a first group of CTUs for the initial transmissions in the first TTI, and the regrouped pattern has a mapping between at least one UE of the first group of RULL-UEs and a second group of CTUs for the redundant transmission in the second TTI. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification