ACK/NACK resource allocation method, and corresponding user equipment and base station
View Patent ↗The present disclosure provides an acknowledgment message resource allocation method applicable to an NB-IoT TDD cell, and a corresponding base station and corresponding user equipment for performing the method. The user equipment according to an embodiment of the present invention includes: a receiving unit, configured to receive allocation information of acknowledgment message transmission resources, the allocation information including offset indication information instructing an offset j 0 of a start time of the acknowledgment message transmission resources with respect to a reference time, and the offset j 0 instructing an offset expressed by a number of NB-IoT uplink slots; and a transmitting unit, configured to perform acknowledgment message transmission based on the allocation information.
1. A method performed by a user equipment (UE), comprising;
detecting, by the UE in an NB-IoT system supporting TDD, a NPDSCH ending in subframe n;
starting a transmission of ACK/NACK after J 0 NB-IoT UL slots following the end of subframe n+12, wherein the J 0 is an offset value and NB-IoT UL slots are determined from a set of UL subframes configured for NB-IoT UL transmission; and
determining a subcarrier spacing Δf, wherein the subcarrier spacing Δf is used for the transmission of the ACK/NACK;
in response to determining that the subcarrier spacing Δf=3.75 kHz,
setting the J 0= 0 in response to determining that a value in an ACK/NACK resource field in DCI corresponding to one of {0, 1, 2, 3, 4, 5, 6, 7}; and
setting the J 0 =4 in response to determining that a value in an ACK/NACK resource field in DCI corresponding to one of {8, 9, 10, 11, 12, 13, 14, 15};
in response to determining that the subcarrier spacing Δf=15 kHz,
setting the J 0 =0 in response to determining that a value in an ACK/NACK resource field in DCI corresponding to one of {0, 1, 2, 3};
setting the J 0 =4 in response to determining that a value in an ACK/NACK resource field in DCI corresponding to one of {4, 5, 6, 7};
setting the J 0 =8 in response to determining that a value in an ACK/NACK resource field in DCI corresponding to one of {8, 9, 10, 11}; and
setting the J 0 =10 in response to determining that a value in an ACK/NACK resource field in DCI corresponding to one of {12, 13, 14, 15}.
2. A user equipment, UE, comprising:
processing circuitry configured to:
detect, by the UE in a NB-IoT system supporting TDD, a NPDSCH ending in subframe n;
start a transmission of ACK/NACK after j 0 NB-IoT UL slots following the end of subframe n+12, wherein, the j 0 is an offset value and NB-IoT UL slots are determined from a set of UL subframes configured for NB-IoT UL transmission; and
determine a subcarrier spacing Δf, wherein the subcarrier spacing Δf is used for the transmission of the ACK/NACK;
in responsive to determining that the subcarrier spacing Δf=3.75 kHz,
setting the j 0 =0 in responsive to determining that a value in a ACK/NACK resource field in DCI corresponding to one of {0, 1, 2, 3, 4, 5, 6, 7}; and
setting the j 0 =4 in responsive to determining that a value in a ACK/NACK resource field in DCI corresponding to one of {8, 9, 10, 11, 12, 13, 14, 15};
in responsive to determining that the subcarrier spacing Δf=15 kHz,
setting the j 0 =0 in responsive to determining that a value in a ACK/NACK resource field in DCI corresponding to one of {0, 1, 2, 3};
setting the j 0 =4 in responsive to determining that a value in a ACK/NACK resource field in DCI corresponding to one of {4, 5, 6, 7};
setting the j 0 =8 in responsive to determining that a value in a ACK/NACK resource field in DCI corresponding to one of {8, 9, 10, 11}; and
setting the j 0 =10 in responsive to determining that a value in a ACK/NACK resource field in DCI corresponding to one of {12, 13, 14, 15}.
3. A method performed by a base station, comprising:
transmitting, by the base station in an NB-IoT system supporting TDD, a NPDSCH ending in subframe n;
starting a reception of ACK/NACK after J 0 NB-IoT UL slots following the end of subframe n+12, wherein the J 0 is an offset value and NB-IoT UL slots are determined from a set of UL subframes configured for NB-IoT UL transmission; and
determining a subcarrier spacing Δf, wherein the subcarrier spacing Δf is used for the reception of the ACK/NACK;
in response to determining that the subcarrier spacing Δf=3.75 kHz,
setting the J 0 =0 in response to determining that a value in an ACK/NACK resource field in DCI corresponding to one of {0, 1, 2, 3, 4, 5, 6, 7}; and
setting the J 0 =4 in response to determining that a value in an ACK/NACK resource field in DCI corresponding to one of {8, 9, 10, 11, 12, 13, 14, 15};
in response to determining that the subcarrier spacing Δf=15 kHz,
setting the J 0 =0 in response to determining that a value in an ACK/NACK resource field in DCI corresponding to one of {0, 1, 2, 3};
setting the J 0 =4 in response to determining that a value in an ACK/NACK resource field in DCI corresponding to one of {4, 5, 6, 7};
setting the J 0 =8 in response to determining that a value in an ACK/NACK resource field in DCI corresponding to one of {8, 9, 10, 11}; and
setting the J 0 =10 in response to determining that a value in an ACK/NACK resource field in DCI corresponding to one of {12, 13, 14, 15}.
4. A base station, comprising:
processing circuitry configured to:
transmit, by the base station in a NB-IoT system supporting TDD, a NPDSCH ending in subframe n;
start a reception of ACK/NACK after j 0 NB-IoT UL slots following the end of subframe n+12, wherein, the j 0 is an offset value and NB-IoT UL slots are determined from a set of UL subframes configured for NB-IoT UL transmission; and
determine a subcarrier spacing Δf, wherein the subcarrier spacing Δf is used for the reception of the ACK/NACK;
in responsive to determining that the subcarrier spacing Δf=3.75 kHz,
setting the j 0 =0 in responsive to determining that a value in a ACK/NACK resource field in DCI corresponding to one of {0, 1, 2, 3, 4, 5, 6, 7}; and
setting the j 0 =4 in responsive to determining that a value in a ACK/NACK resource field in DCI corresponding to one of {8, 9, 10, 11, 12, 13, 14, 15};
in responsive to determining that the subcarrier spacing Δf=15 kHz,
setting the j 0 =0 in responsive to determining that a value in a ACK/NACK resource field in DCI corresponding to one of {0, 1, 2, 3};
setting the j 0 =4 in responsive to determining that a value in a ACK/NACK resource field in DCI corresponding to one of {4, 5, 6, 7};
setting the j 0 =8 in responsive to determining that a value in a ACK/NACK resource field in DCI corresponding to one of {8, 9, 10, 11}; and
setting the j 0 =10 in responsive to determining that a value in a ACK/NACK resource field in DCI corresponding to one of {12, 13, 14, 15}.