Link adaptation in grant-free multiple access systems
First Claim
1. A method, comprising:
- receiving from a base station a modulation and coding scheme (MCS) limit for a contention transmission unit (CTU) access region associated with a grant-free uplink transmission scheme in a multiple access system;
determining at a user equipment (UE) a first MCS index within the MCS limit, the first MCS index determined based on an uplink traffic characteristic and at least one of channel state information or estimated path loss;
sending a first uplink transmission to the base station using a CTU in the CTU access region, the first uplink transmission including user data and the first MCS index determined at the UE; and
determining a maximum MCS level based on an uplink traffic characteristic and at least one of the channel state information or the estimated path loss, wherein determining the first MCS index includes applying a back-off value to the maximum MCS level to determine a reduced MCS level corresponding to the first MCS index.
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Abstract
A BS determines an amount of resource overloading for a contention transmission unit (CTU) access region associated with a grant-free uplink transmission scheme in a multiple access system. The BS determines a modulation and coding scheme (MCS) limit indicating a maximum MCS level for the CTU access region. The BS sends the MCS limit to a plurality of user equipments (UEs) associated with the first CTU access region. A UE receives from the base station the MCS limit and determines a first MCS index within the MCS limit for a first uplink transmission. The UE sends the first uplink transmission to the base station using a CTU in the CTU access region. The first uplink transmission includes user data and the first MCS index determined at the first UE.
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Citations
17 Claims
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1. A method, comprising:
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receiving from a base station a modulation and coding scheme (MCS) limit for a contention transmission unit (CTU) access region associated with a grant-free uplink transmission scheme in a multiple access system; determining at a user equipment (UE) a first MCS index within the MCS limit, the first MCS index determined based on an uplink traffic characteristic and at least one of channel state information or estimated path loss; sending a first uplink transmission to the base station using a CTU in the CTU access region, the first uplink transmission including user data and the first MCS index determined at the UE; and determining a maximum MCS level based on an uplink traffic characteristic and at least one of the channel state information or the estimated path loss, wherein determining the first MCS index includes applying a back-off value to the maximum MCS level to determine a reduced MCS level corresponding to the first MCS index. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A user equipment (UE), comprising:
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a processor; and a computer readable storage medium having instructions stored thereon for execution by the processor, wherein the instructions configure the processor to; receive from a base station a modulation and coding scheme (MCS) limit for a contention transmission unit (CTU) access region associated with a grant-free uplink transmission scheme in a multiple access system; determine a first MCS index within the MCS limit, the first MCS index determined based on an uplink traffic characteristic and at least one of channel state information or estimated path loss; send a first uplink transmission to the base station using a CTU in the CTU access region, the first uplink transmission including user data and the first MCS index; and determine a maximum MCS level based on the uplink traffic characteristic and at least one of the channel state information or the estimated path loss, wherein determining the first MCS index includes applying a back-off value to the maximum MCS level to determine a reduced MCS level corresponding to the first MCS index. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A non-transitory computer-readable medium storing computer instructions, that when executed by one or more processors, cause the one or more processors to perform the steps of:
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receiving from a base station a modulation and coding scheme (MCS) limit for a contention transmission unit (CTU) access region associated with a grant-free uplink transmission scheme in a multiple access system; determining at a user equipment (UE) a first MCS index within the MCS limit, the first MCS index determined based on an uplink traffic characteristic and at least one of channel state information or estimated path loss; sending a first uplink transmission to the base station using a CTU in the CTU access region, the first uplink transmission including user data and the first MCS index determined at the UE; and determining a maximum MCS level based on an uplink traffic characteristic and at least one of the channel state information or the estimated path loss, wherein determining the first MCS index includes applying a back-off value to the maximum MCS level to determine a reduced MCS level corresponding to the first MCS index. - View Dependent Claims (14, 15, 16, 17)
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Specification