System and method for uplink grant-free transmission scheme
First Claim
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1. A method comprising:
- implementing, by a base station (BS), a grant-free uplink transmission scheme, wherein the grant-free uplink transmission scheme;
defines a first contention transmission unit (CTU) access region, the first CTU access region being a time-frequency region in a time-frequency domain;
defines a default CTU mapping scheme by mapping at least some of a plurality of CTUs to the first CTU access region, each of the plurality of CTUs being a combination of at least time, frequency and pilot;
defines a default user equipment (UE) mapping scheme for pre-mapping a first UE to a first CTU in the plurality of CTUs and a second UE to a second CTU in the plurality of CTUs, the second CTU being different than the first CTU;
receiving, by the BS from the first UE, an uplink data transmission performed according to the grant-free uplink transmission scheme, the uplink data transmission being received on the first CTU that is pre-mapped to the first UE without using a resource request/grant mechanism; and
decoding, by the BS, the uplink data transmission blindly.
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Abstract
A method embodiment includes implementing, by a base station (BS), a grant-free uplink transmission scheme. The grant-free uplink transmission scheme defines a first contention transmission unit (CTU) access region in a time-frequency domain, defines a plurality of CTUs, defines a default CTU mapping scheme by mapping at least some of the plurality of CTUs to the first CTU access region, and defines a default user equipment (UE) mapping scheme by defining rules for mapping a plurality of UEs to the plurality of CTUs.
34 Citations
23 Claims
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1. A method comprising:
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implementing, by a base station (BS), a grant-free uplink transmission scheme, wherein the grant-free uplink transmission scheme; defines a first contention transmission unit (CTU) access region, the first CTU access region being a time-frequency region in a time-frequency domain; defines a default CTU mapping scheme by mapping at least some of a plurality of CTUs to the first CTU access region, each of the plurality of CTUs being a combination of at least time, frequency and pilot; defines a default user equipment (UE) mapping scheme for pre-mapping a first UE to a first CTU in the plurality of CTUs and a second UE to a second CTU in the plurality of CTUs, the second CTU being different than the first CTU; receiving, by the BS from the first UE, an uplink data transmission performed according to the grant-free uplink transmission scheme, the uplink data transmission being received on the first CTU that is pre-mapped to the first UE without using a resource request/grant mechanism; and decoding, by the BS, the uplink data transmission blindly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A base station (BS) comprising:
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a memory storage comprising instructions; and one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to; implement a grant-free uplink transmission scheme, wherein the grant-free uplink transmission scheme; defines one or more contention transmission unit (CTU) access regions in a time-frequency domain; creates a default CTU mapping scheme by mapping a plurality of CTUs to the one or more CTU access regions, each of the plurality of CTUs being a combination of at least time, frequency and pilot; and creates a default user equipment (UE) mapping scheme that pre-maps a first UE to a first CTU in the plurality of CTUs and a second UE to a second CTU in the plurality of CTUs, the second CTU being different than the first CTU; receive an uplink data transmission from the first UE on the first CTU that is pre-mapped to the first UE according to the grant-free uplink transmission scheme without using a request/grant mechanism; decode the uplink data transmission blindly; and indicate, to the first UE, that decoding the uplink data transmission blindly was successful. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method comprising:
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transmitting, by a first user equipment (UE) to a base station (BS), an uplink data transmission on a first CTU according to an grant free transmission scheme without using a request/grant mechanism, wherein the grant free transmission scheme defines a pre-mapping between the first UE and the first CTU in a plurality of CTUs for uplink data transmissions, a pre-mapping between a second UE and a second CTU in the plurality of CTUs, the second CTU being different than the first CTU, and wherein each of the plurality of CTUs is a combination of at least time, frequency and pilot; and determining, by the first UE, whether a collision has occurred based on an indication by the BS; and resolving, by the first UE, the collision using an asynchronous hybrid automatic repeat request (HARQ) method when the UE determines that the collision has occurred. - View Dependent Claims (18, 19)
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20. A first user equipment (UE) comprising:
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a memory storage comprising instructions; and one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to; transmit, to a base station (BS), an uplink data transmission on a first CTU according to an grant free transmission scheme without using a request/grant mechanism, wherein the grant free transmission scheme defines a pre-mapping between the first UE and the first CTU in a plurality of CTUs for uplink data transmissions, a pre-mapping between a second UE and a second CTU in the plurality of CTUs, the second CTU being different than the first CTU, and wherein each of the plurality of CTUs is a combination of at least time, frequency and pilot; determine whether a collision has occurred based on an indication by the BS; and re-transmit, to the BS, the uplink data transmission using an asynchronous hybrid automatic repeat request (HARQ) mechanism when the first UE determines that a collision has occurred. - View Dependent Claims (21, 22, 23)
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Specification