Cooperation with digital frequency-translation repeater for uplink transmission and reception-UE behavior
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE generates R layers of baseband data signals to be carried on N 2 subcarriers, where N 2 and R are positive integers. The UE maps each of the R layers of baseband data signals to N T antennas in some or all of L first transmission time intervals using R precoders, with each precoder containing L·N T elements, and N T and L being positive integers. The UE transmits a first OFDM-based time-domain signal corresponding to the mapped baseband data signals across the L first transmission time intervals to a base station via one or more repeaters, where the L first transmission time intervals correspond to one second transmission time interval.
1 . A method of wireless communication of a user equipment (UE), comprising:
generating R layers of baseband data signals to be carried on N 2 subcarriers, N 2 and R being positive integers;
mapping each of the R layers of baseband data signals to N T antennas of the UE in some or all of L first transmission time intervals by R precoders, respectively, wherein N T and L are positive integers and each of the R precoders includes L·N T elements; and
transmitting, to a base station via one or more repeaters, a first OFDM-based time-domain signal corresponding to the mapped baseband data signals across the L first transmission time intervals, wherein the L first transmission time intervals correspond to one second transmission time interval.
2 . The method of claim 1 , wherein N T is less than R.
3 . The method of claim 1 , wherein the first OFDM-based time-domain signal is generated according to a first subcarrier spacing and N 1 subcarriers, N 1 being a positive integer.
4 . The method of claim 3 , wherein each modulation symbol carried by each subcarrier of the N 2 subcarriers is mapped from a linear combination of modulation symbols on one or more subcarriers of the N 1 subcarriers.
5 . The method of claim 4 , wherein the mapping function is defined as
j
=
i
+
N
1
-
N
2
2
,
such that the modulation symbol carried by an i-th subcarrier of the N 2 subcarriers is mapped from a j-th subcarrier of the N 1 subcarriers.
6 . The method of claim 4 , wherein the time-domain signal is sent to a repeater that transforms the first OFDM-based time-domain signal to a second OFDM-based time-domain signal corresponding to N 2 subcarriers and a second subcarrier spacing.
7 . The method of claim 1 , further comprising:
receiving indications of the R precoders from the base station.
8 . The method of claim 1 , further comprising:
measuring reference signals transmitted from the base station to determine channel state information for determining the R precoders.
9 . The method of claim 1 , further comprising:
receiving control information from a base station, the control information including at least one of: (a) available time-frequency resources for UE transmission, and (b) a transmission control information state or spatial relation for a transmission beam used in each of the L first transmission time intervals.
10 . The method of claim 1 , wherein the UE is configured to transmit baseband data signals through one or more repeaters, and wherein the method further comprises:
receiving control information from a base station, the control information including parameters for the one or more repeaters to receive transmission of the UE in a first frequency and forward the signal in a second frequency.
11 . The method of claim 10 , further comprising:
forwarding, to the one or more repeaters, the control information including parameters.
12 . The method of claim 10 , wherein the control information includes at least one of: (a) frequency band parameters for the first and second frequencies, (b) associated channel bandwidths and subcarrier spacings in the first and second frequencies, (c) a transmission control information state or spatial relation for a reception beam used in each first transmission time interval, and (d) fast Fourier transform (FFT) and inverse FFT sizes, and a mapping relationship from data signals on the N 1 subcarriers in the first frequency to data signals on the N 2 subcarriers in the second frequency.
13 . An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
generate R layers of baseband data signals to be carried on N 2 subcarriers, N 2 and R being positive integers;
map each of the R layers of baseband data signals to N T antennas of the UE in some or all of L first transmission time intervals by R precoders, respectively, wherein N T and L are positive integers and each of the R precoders includes L·N T elements; and
transmit, to a base station via one or more repeaters, a first OFDM-based time-domain signal corresponding to the mapped baseband data signals across the L first transmission time intervals, wherein the L first transmission time intervals correspond to one second transmission time interval.
14 . The apparatus of claim 13 , wherein N T is less than R.
15 . The apparatus of claim 13 , wherein the at least one processor is further configured to generate the first OFDM-based time-domain signal according to a first subcarrier spacing and N 1 subcarriers, N 1 being a positive integer.
16 . The apparatus of claim 15 , wherein the at least one processor is further configured to map each modulation symbol carried by each subcarrier of the N 2 subcarriers from a linear combination of modulation symbols on one or more subcarriers of the N 1 subcarriers.
17 . The apparatus of claim 16 , wherein the mapping function is defined as
j
=
i
+
N
1
-
N
2
2
,
such that the modulation symbol carried by an i-th subcarrier of the N 2 subcarriers is mapped from a j-th subcarrier of the N 1 subcarriers.
18 . The apparatus of claim 16 , wherein the at least one processor is further configured to send the time-domain signal to a repeater that transforms the first OFDM-based time-domain signal to a second OFDM-based time-domain signal corresponding to N 2 subcarriers and a second subcarrier spacing.
19 . The apparatus of claim 13 , wherein the at least one processor is further configured to:
receive indications of the R precoders from the base station.
20 . A non-transitory computer-readable medium storing computer executable code for wireless communication of a user equipment (UE), comprising code to:
generate R layers of baseband data signals to be carried on N 2 subcarriers, N 2 and R being positive integers;
map each of the R layers of baseband data signals to N T antennas of the UE in some or all of L first transmission time intervals by R precoders, respectively, wherein N T and L are positive integers and each of the R precoders includes L·N T elements; and
transmit, to a base station via one or more repeaters, a first OFDM-based time-domain signal corresponding to the mapped baseband data signals across the L first transmission time intervals, wherein the L first transmission time intervals correspond to one second transmission time interval.