Downlink framework for distributed MIMO receivers
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 receives N r1 RF signals at N r1 antennas on a first time-frequency resource. The N r1 RF signals carrying L layers of data generated at a base station. N r1 and L are positive integers. L is greater than N r1 . The UE receives N r2 RF signals at the N r2 antennas on a second time-frequency resource. The N r2 RF signals carries the L layers of data. N r2 is a positive integer. The UE obtains N r1 baseband signals from the N r1 RF signals. The UE obtains N r2 baseband signals from the N r2 RF signals. The UE determines the L layers of data based on the N r1 baseband signals and the N r2 baseband signals.
1 . A method of wireless communication of a user equipment (UE), comprising:
receiving, in a first time slot and from a base station, N r1 RF signals at N r1 antennas on a first time-frequency resource on a first frequency band, the N r1 RF signals carrying L layers of data generated at the base station, N R1 and L being positive integers, L being greater than N r1 ;
receiving, in the same first time slot and from a wireless device, N r2 RF signals at the N r2 antennas on a second time-frequency resource on a second frequency band, the N r2 , RF signals carrying the L layers of data, N r2 being a positive integer and less than L, wherein the N r2 antennas contains one or more antennas from the N r2 antennas, wherein the first frequency band and the second frequency band do not overlap, and wherein the N r2 RF signals are generated by the wireless device based on the N r1 RF signals transmitted from the base station in the same first time slot;
obtaining N r1 baseband signals from the N r1 RF signals;
obtaining N r2 baseband signals from the N r2 RF signals; and
determining the L layers of data based on the N r1 baseband signals and the N r2 baseband signals.
2 . The method of claim 1 , further comprising
determining that the N r1 RF signals are originated from N, RF signals transmitted at N t antennas of the base station, N t being a positive integer and greater than N r1 .
3 . The method of claim 1 , further comprising
determining that the N r2 RF signals are originated from N r2 RF signals transmitted at N r2 antennas of the wireless device.
4 . A method of wireless communication of a wireless device, comprising:
receiving, at the wireless device in a first time slot, M r RF signals at M r antennas on a first time-frequency resource on a first frequency band, the M r RF signals carrying L layers of data generated at a base station, M r and L being positive integers, L being greater than M r ; and
generating, by the wireless device in the first time slot, M t RF signals on a second time-frequency resource on a second frequency band for carrying the L layers of data based on the received M r RF signals, wherein the first frequency band and the second frequency band do not overlap; and
transmitting, in the first time slot, the M t RF signals at M t antennas on the second time-frequency resource to a user equipment (UE) operating N r1 antennas on the first time-frequency resource and operating N r2 antennas on the second time-frequency resource to receive RF signals on the first and second frequency bands simultaneously, the M t RF signals carrying the L layers of data, wherein N r1 is a positive integer and less than L, N r2 is a positive integer and less than L, wherein the N r2 antennas contains one or more antennas from the N r1 antennas.
5 . The method of claim 4 , further comprising:
amplifying and forwarding the M r RF signals to generate M t amplified and forwarded signals;
shifting carrier frequency of the M t amplified and forwarded signals to the second time-frequency resource to generate the M t RF signals.
6 . The method of claim 4 , wherein the M r RF signals are originated from RF signals transmitted from the base station.
7 . 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:
receive, in a first time slot and from a base station, N r1 RF signals at N r1 antennas on a first time-frequency resource on a first frequency band, the N r1 RF signals carrying L layers of data generated at the base station, N r1 and L being positive integers, L being greater than N r1 ;
receive, in the same first time slot and from a wireless device, N r2 RF signals at the N r2 antennas on a second time-frequency resource on a second frequency band, the N 2 RF signals carrying the L layers of data, N r2 being a positive integer and less than L, wherein the N r2 antennas contains one or more antennas from the N r1 antennas, wherein the first frequency band and the second frequency band do not overlap, and wherein the N r2 RF signals are generated by the wireless device based on the N r1 RF signals transmitted from the base station in the same first time slot;
obtain N r1 baseband signals from the N r1 RF signals;
obtain N r2 baseband signals from the N r2 RF signals; and
determine the L layers of data based on the N r1 baseband signals and the N r2 baseband signals.
8 . The apparatus of claim 7 , wherein the at least one processor is further configured to
determine that the N r1 RF signals are originated from N t RF signals transmitted at N t antennas of the base station, N t being a positive integer and greater than N r1 .
9 . The apparatus of claim 7 , wherein the at least one processor is further configured to
determine that the N r2 RF signals are originated from N r2 RF signals transmitted at N r2 antennas of the wireless device.