Uplink data channel design for narrowband devices

Patent metadata

Field	Value
Publication number	US-11115977-B2
Application number	US-201916369308-A
Country	US
Kind code	B2
Filing date	Mar 29, 2019
Priority date	Jan 11, 2016
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

Aspects of the present disclosure provide techniques for uplink (UL) data channel design. An example method is provided for operations which may be performed by a first apparatus. The example method generally comprises determining a number of pilot symbols to transmit for one or more slots of a first subframe based, at least in part, on a coverage enhancement (CE) level, and transmitting at least one uplink data channel having the determined number of pilot symbols in the one or more slots of the first subframe.

First claim

What is claimed is:

1. A method for wireless communications by a user equipment (UE) comprising:
determining a first set of resources for transmission of data and a second set of resources for transmission of at least one pilot;
determining a sequence for the transmission of the at least one pilot over the second set of resources based on at least one of a cell ID, a timing with respect to a slot boundary, a timing with respect to a subframe boundary, an absolute timing, a timing with respect to hopping instances, a rotation applied to a constellation, a cyclic prefix length, a UE ID, a cyclic shift, a repetition level, a modulation type, or an indication in a downlink grant;
transmitting the data over the first set of resources based at least in part on a first modulation scheme; and
transmitting the at least one pilot over the second set of resources based at least in part on a second modulation scheme, wherein the at least one pilot is based at least in part on the sequence.

2. The method of claim 1 , wherein the first modulation scheme comprises pi/4 QPSK or pi/2 BPSK and the second modulation scheme comprises pi/4 QPSK or pi/2 BPSK.

3. The method of claim 1 , wherein:
the first modulation scheme is determined based on receiving a downlink grant containing the modulation scheme; and
the second modulation scheme is determined based on the first modulation scheme.

4. The method of claim 1 , wherein:
the first and second modulation schemes are the same.

5. The method of claim 1 , further comprising determining a phase offset to be applied to at least one of the first modulation scheme or the second modulation scheme based at least on at least one of the following:
the cell ID, the timing with respect to the slot boundary, the timing with respect to the subframe boundary, the absolute timing, or the timing with respect to hopping instances.

6. The method of claim 1 , further comprising
selecting a set of constellation points in the second modulation scheme, wherein
transmitting the at least one pilot over the second set of resources is based on the set of the constellation points.

7. The method of claim 6 , wherein:
the selecting the set of the constellation points comprises selecting two constellation points regardless of the first or second modulation scheme; and
the determining the sequence is performed independently of the first or second modulation scheme.

8. An apparatus for wireless communications, comprising:
at least one processor;
memory coupled with the at least one processor, the memory comprising instructions executable by the at least one processor to cause the apparatus to:
determine a first set of resources for transmission of data and a second set of resources for transmission of at least one pilot;
determine a sequence for the transmission of the at least one pilot over the second set of resources based on at least one of a cell ID, a timing with respect to a slot boundary, a timing with respect to a subframe boundary, an absolute timing, a timing with respect to hopping instances, a rotation applied to a constellation, a cyclic prefix length, a UE ID, a cyclic shift, a repetition level, a modulation type, or an indication in a downlink grant;
transmit the data over the first set of resources based at least in part on a first modulation scheme; and
transmit the at least one pilot over the second set of resources based at least in part on a second modulation scheme, wherein the at least one pilot is based at least in part on the sequence.

9. The apparatus of claim 8 , wherein the first modulation scheme comprises pi/4 QPSK or pi/2 BPSK and the second modulation scheme comprises pi/4 QPSK or pi/2 BPSK.

10. The apparatus of claim 8 , wherein:
the first modulation scheme is determined based on receiving a downlink grant containing the modulation scheme; and
the second modulation scheme is determined based on the first modulation scheme.

11. The apparatus of claim 8 , wherein:
the first and second modulation schemes are the same.

12. The apparatus of claim 8 , wherein the memory further comprises instructions executable by the at least one processor to cause the apparatus to determine a phase offset to be applied to at least one of the first modulation scheme or the second modulation scheme based at least on at least one of the following:
the cell ID, the timing with respect to the slot boundary, the timing with respect to the subframe boundary, the absolute timing, or the timing with respect to hopping instances.

13. The apparatus of claim 8 , wherein the memory further comprises instructions executable by the at least one processor to cause the apparatus to
select a set of constellation points in the second modulation scheme, wherein
transmitting the at least one pilot over the second set of resources is based on the set of the constellation points.

14. The apparatus of claim 13 , wherein:
the selecting the set of the constellation points comprises selecting two constellation points regardless of the first or second modulation scheme; and
the memory further comprises instructions executable by the at least one processor to cause the apparatus to determine the sequence independently of the first or second modulation scheme.

15. An apparatus for wireless communications, comprising:
means for determining a first set of resources for transmission of data and a second set of resources for transmission of at least one pilot;
means for determining a sequence for the transmission of the at least one pilot over the second set of resources based on at least one of a cell ID, a timing with respect to a slot boundary, a timing with respect to a subframe boundary, an absolute timing, a timing with respect to hopping instances, a rotation applied to a constellation, a cyclic prefix length, a UE ID, a cyclic shift, a repetition level, a modulation type, or an indication in a downlink grant;
means for transmitting the data over the first set of resources based at least in part on a first modulation scheme; and
transmitting the at least one pilot over the second set of resources based at least in part on a second modulation scheme, wherein the at least one pilot is based at least in part on the sequence.

16. A non-transitory computer-readable medium for wireless communications by an apparatus, comprising:
instructions that, when executed by at least one processor, cause the apparatus to:
determine a first set of resources for transmission of data and a second set of resources for transmission of at least one pilot;
determine a sequence for the transmission of the at least one pilot over the second set of resources based on at least one of a cell ID, a timing with respect to a slot boundary, a timing with respect to a subframe boundary, an absolute timing, a timing with respect to hopping instances, a rotation applied to a constellation, a cyclic prefix length, a UE ID, a cyclic shift, a repetition level, a modulation type, or an indication in a downlink grant;
transmit the data over the first set of resources based at least in part on a first modulation scheme; and
transmit the at least one pilot over the second set of resources based at least in part on a second modulation scheme, wherein the at least one pilot is based at least in part on the sequence.

Assignees

• Qualcomm Inc

Inventors

• Fakoorian Seyed Ali Akbar
• Rico Alvarino Alberto
• Gaal Peter
• Chen Wanshi
• Wei Yongbin
• Montojo Juan
• Wang Renqiu
• Xu Hao
• Wang Xiaofeng

Classifications

• H04L27/2082

  for offset or staggered quadrature phase shift keying · CPC title

• H04W72/0446 Primary

  Resources in time domain, e.g. slots or frames · CPC title

• H04L5/0046 Primary

  Determination of the number of bits transmitted on different sub-channels · CPC title

• H04L5/0048 Primary

  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

• H04L27/2078

  in which the phase change per symbol period is constrained (coset coding H04L27/186) · CPC title