OFDMA-based multiplexing of uplink control information
AssigneeApple Inc.
InventorsRalf Matthias Bendlin, Gang Xiong, Jong-Kae Fwu, Hong He, Yushu Zhang, Seunghee Han, Yuan Zhu
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Abstract
Methods and apparatus are described for transmitting uplink control information (UCI) over an OFDMA-based uplink. In some embodiments, UCI symbols are mapped to resource elements (REs) in the time/frequency resource grid to maximize frequency diversity. In some embodiments, UCI is mapped in a manner that takes into account channel estimation performance by mapping UCI symbols to those REs that are closest (in terms of OFDM subcarriers/symbols) to REs that carry reference signals.
Claims20
An apparatus comprising:
- at least one processor configured to cause a UE (user equipment) to:
- multiplex uplink control information (UCI) with uplink shared channel (UL-SCH) data for transmission over orthogonal frequency division multiplexing (OFDM) symbols in the time domain and in physical resource blocks (PRBs) in the frequency domain, wherein the OFDM symbols and PRBs include a plurality of time-frequency resource elements (REs);
- divide channel state information (CSI) bits into multiple segments;
- and
- map UCI including modulated hybrid automatic request repeat acknowledgement (HARQ-ACK) bits and modulated CSI bits to REs of OFDM symbols that do not contain demodulation reference signal (DMRS) REs, wherein said mapping includes mapping the modulated CSI bits of the multiple segments to REs first in the frequency domain and then in the time domain, and map UL-SCH data to REs of the PRB first in the frequency domain and then in the time domain after mapping the modulated CSI bits.
A non-transitory computer-readable medium storing program instructions executable by at least one processor of a user equipment (UE) to:
- multiplex uplink control information (UCI) with uplink shared channel (UL-SCH) data for transmission over orthogonal frequency division multiplexing (OFDM) symbols in the time domain and in physical resource blocks (PRBs) in the frequency domain, wherein the OFDM symbols and PRBs include a plurality of time-frequency resource elements (REs);
- divide channel state information (CSI) bits into multiple segments;
- map UCI including modulated hybrid automatic request repeat acknowledgement (HARQ-ACK) bits and modulated CSI bits to REs of OFDM symbols that do not contain demodulation reference signal (DMRS) REs, wherein said mapping includes mapping the modulated CSI bits of the multiple segments to REs first in the frequency domain and then in the time domain, and map UL-SCH data to REs of the PRB first in the frequency domain and then in the time domain after mapping the modulated CSI bits.
A method comprising:
- by a user equipment device (UE):
- multiplexing uplink control information (UCI) with uplink shared channel (UL-SCH) data for transmission over orthogonal frequency division multiple access (OFDM) symbols in the time domain and in physical resource blocks (PRBs) in the frequency domain, wherein the OFDM symbols and PRBs include a plurality of time-frequency resource elements (REs);
- dividing channel state information (CSI) bits into multiple segments;
- mapping UCI including modulated hybrid automatic request repeat acknowledgement (HARQ-ACK) bits and modulated CSI bits to REs of OFDM symbols that do not contain demodulation reference signal (DMRS) REs, wherein said mapping includes mapping the modulated CSI bits of the multiple segments to REs first in the frequency domain and then in the time domain, and mapping UL-SCH data to REs of the PRB first in the frequency domain and then in the time domain after mapping the modulated CSI bits.
Dependencies are inferred from the claim text.