Ack/nack signals for next generation lte devices and systems

Patent metadata

Field	Value
Publication number	US-2019372723-A1
Application number	US-201916408223-A
Country	US
Kind code	A1
Filing date	May 9, 2019
Priority date	Jun 17, 2015
Publication date	Dec 5, 2019
Grant date	—

Abstract

Devices and methods of providing symmetric UL and DL ACK/NACKs is generally described. UL ACK/NACKs of different UEs are multiplexed and received by a UE with a PUSCH. The receiving UE in response transmits the DL ACK/NACK. The ACK/NACK may be transmitted in a localized or distributed manner among subbands that may be adjacent or each may have blocks separated by blocks of a different subband. The ACK and NACK may use independent resources or the NACK may not be transmitted on the single ACK/NACK resource, the lack of an ACK serving as a NACK. The ACK/NACK may be transmitted using a beamforming weight shaped by the received PUSCH/PDSCH. The ACK/NACK symbol may be located in the first symbol, adjacent to the PUSCH/PDSCH, or at the end of a TTI. If adjacent, the UL grant or UL assignment may indicate whether the ACK/NACK resource is used by the PUSCH/PDSCH.

First claim

1 . (canceled)

2 . An apparatus of user equipment (UE) comprising:
processing circuitry arranged to:
decode, from an evolved NodeB (eNB) a physical downlink shared channel (PDSCH);
in response to the PDSCH, generate a Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ ACK/NACK), the HARQ ACK/NACK generated using:
r ( n )=exp( jαn ), r u,v ( n )

where r u,v (n) is a base sequence; u is a sequence group number, v is a sequence number and α is a cyclic shift that is different for an ACK than for a NACK; and
encode the HARQ ACK/NACK for transmission to the eNB in a physical uplink control channel (PUCCH); and
memory configured to store the HARQ ACK/NACK.

3 . The apparatus of claim 2 , wherein the processing circuitry is further arranged to:
map values for a pair of HARQ-ACK information bits of the HARQ ACK/NACK to different sequences, each sequence having a unique cyclic shift.

4 . The apparatus of claim 2 , wherein:
the cyclic shift varies as a function of a symbol and slot number of the PUCCH.

5 . The apparatus of claim 4 , wherein:
the sequence is a Zadoff-Chu (ZC) sequence, and the processing circuitry is further arranged to determine the base sequence as a function of a physical cell identity of the eNB.

6 . The apparatus of claim 4 , wherein:
the sequence is a Zadoff-Chu (ZC) sequence, and the processing circuitry is further arranged to determine the base sequence as a function of a virtual cell identity of the eNB.

7 . The apparatus of claim 4 , wherein:
the sequence is a Zadoff-Chu (ZC) sequence, and the processing circuitry is further arranged to determine the base sequence as a function of at least one of slot index of the PUCCH, a subframe index of the PUCCH, or a frame index of the PUCCH.

8 . The apparatus of claim 2 , wherein:
the processing circuitry is further arranged to decode, from the eNB, a physical downlink control channel (PDCCH) that comprises a UL grant to transmit the PUSCH, and the UL grant comprises an indicator that indicates one of a plurality of values in which one value indicates that a HARQ ACK/NACK resource for HARQ ACK/NACK symbols is to be free from mapping of the PUSCH to the HARQ ACK/NACK resource and another value indicates the PUSCH is to be mapped to the HARQ ACK/NACK resource.

9 . The apparatus of claim 2 , wherein the processing circuitry is further arranged to:
apply a repetition code of a predetermined length to an ACK/NACK bit to form a repeated bit, modulate the repeated bit using one of binary phase shift keying (BPSK) and quadrature PSK (QPSK) to form a modulated symbol, apply a spreading code to the modulated symbol to form a spread symbol, apply cell-specific scrambling to the spread symbol to form a scrambled symbol, a scrambling seed of the cell-specific scrambling defined as a function of at least one of a physical cell identity of the eNB, a virtual cell identity of the eNB, a slot index of the PUCCH, a subframe index of the PUCCH and a frame index of the PUCCH, and map the scrambled signal starting from a lowest frequency index within an allocated subband to form a modulated ACK/NACK symbol of the HARQ ACK/NACK.

10 . The apparatus of claim 2 , wherein:
an ACK/NACK resource of the HARQ ACK/NACK is a function of subband index (I SB ) and spreading code index (I SF ) used for the HARQ ACK/NACK, a resource index for the HARQ ACK/NACK is a function of at least one of a cell-specific parameter, a UE-specific parameter, a parameter signaled in a Downlink Control Information (DCI) format, and, as used for one of the PDSCH and a physical uplink shared channel (PUSCH), at least one of: a beamforming index, a slot index, a subframe index, a frame index and a physical resource block index, and the cell-specific parameter is configured by master information block (MIB), system information block (SIB) or dedicated Radio Resource Control (RRC) signaling, the UE-specific parameter is configured from one of a primary cell and a serving cell via dedicated RRC signaling, and the parameter signaled in the DCI format is one of the subband index and a Demodulation Reference Signal (DM-RS) used for the one of the PDSCH and PUSCH.

11 . The apparatus of claim 2 , wherein the processing circuitry is further arranged to:
time-division multiplex the HARQ ACK/NACK with a physical uplink control channel (PUCCH), the HARQ ACK/NACK transmitted in a beamformed HARQ ACK/NACK channel, and dynamically shape a beamforming weight of the HARQ ACK/NACK channel to follow beamforming of a previous PUSCH such that a transmit analog beam direction of the HARQ ACK/NACK channel is based on the previous PUSCH, and digital precoding of the HARQ ACK/NACK channel is based on a channel estimation obtained from an UL Demodulation Reference Signal (DM-RS) transmitted from the UE.

12 . The apparatus of claim 2 , wherein:
the processing circuitry is further arranged to time-division multiplex the HARQ ACK/NACK with a physical uplink control channel (PUCCH), the HARQ ACK/NACK transmitted in a beamformed HARQ ACK/NACK channel, and a HARQ ACK/NACK symbol is a first symbol of a DL Transmission Time Interval (TTI), the HARQ ACK/NACK symbol is adjacent to the PDSCH, the HARQ ACK/NACK channel is disposed at an end of the DL TTI after the PDSCH.

13 . The apparatus of claim 2 , wherein:
the sequence is a Zadoff-Chu (ZC) sequence (x u (n)), and the processing circuitry is further arranged to, if a ZC sequence length (N ZC ) is less than a subband size (K), generate the base sequence using a cyclic extension for the ZC sequence:
r u,v ( n )= x q ( n mod N ZC ),0≤ n<K.

14 . The apparatus of claim 2 , wherein:
the sequence is a Zadoff-Chu (ZC) sequence (x u (n)), and the processing circuitry is further arranged to, if a ZC sequence length (N ZC ) is less than a subband size (K), generate the base sequence by puncturing a carrier in the subband such that:

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Assignees

• Intel Ip Corp

Inventors

• Xiong Gang
• Niu Huaning
• Shirani-Mehr Hooman
• Zhang Yushu
• Zhu Yuan

Classifications

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L27/2035

  using a single or unspecified number of carriers · CPC title

• H04L27/206

  using a pair of orthogonal carriers, e.g. quadrature carriers · CPC title

• H04L1/18

  Automatic repetition systems, e.g. Van Duuren systems · CPC title

• H04L5/0055

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title