Uplink data channel design for narrowband devices

Patent metadata

Field	Value
Publication number	US-12069629-B2
Application number	US-202318297803-A
Country	US
Kind code	B2
Filing date	Apr 10, 2023
Priority date	Jan 11, 2016
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

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 first apparatus, comprising:
determining a number of pilot symbols to transmit for one or more slots of a first subframe based, at least in part, on a type of coverage, wherein the number of pilot symbols comprises at least three pilot symbols for a first type of coverage; 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.

2. The method of claim 1 , wherein the transmitting comprises transmitting the uplink data channel such that symbols of the uplink data channel are code division multiplexed with symbols transmitted by a second apparatus.

3. The method of claim 2 , wherein transmitting the uplink data channel such that symbols of the uplink data channel are code division multiplexed with the symbols transmitted by the second apparatus, comprises at least one of:
applying a Walsh spreading to a number of slots of the one or more slots; or
applying discrete Fourier transform (DFT) spreading to a number of slots of the one or more slots.

4. The method of claim 3 , wherein the number of slots comprises four slots.

5. The method of claim 2 , wherein transmitting the uplink data channel such that symbols of the uplink data channel are code division multiplexed with the symbols transmitted by the second apparatus, comprises performing code division multiplexing on a number of symbols in each of the one or more slots.

6. The method of claim 5 , wherein the number of symbols on which code division multiplexing is performed comprises at least four symbols.

7. The method of claim 6 , wherein based on the at least four symbols on which the code division multiplexing is performed, the number of pilot symbols comprises at least four pilot symbols.

8. The method of claim 1 , wherein the determining is based on at least one of: a physical uplink shared channel (PUSCH) repetition level, a PUSCH modulation and coding scheme, an RRC configuration message, or an uplink (UL) grant.

9. The method of claim 1 , wherein:
the first subframe has a longer duration relative to a second subframe used by a second apparatus; and
the first subframe has a lower frequency tone spacing scheme based on the longer duration of the first subframe.

10. The method of claim 9 , further comprising adjusting a cyclic prefix (CP) length to maintain a block orthogonality between the second subframe and the first subframe.

11. The method of claim 10 , wherein the second subframe utilizes an extended CP.

12. The method of claim 9 , wherein the first subframe corresponds to subframes having a higher frequency tone spacing scheme with a cyclic prefix (CP) of a shorter length than an extended CP.

13. The method of claim 9 , further comprising:
determining a sounding reference signal (SRS) is scheduled for transmission in a third subframe; and
configuring the apparatus to transmit in the subframe in which SRS is scheduled with a higher frequency tone spacing scheme relative to the first subframe.

14. The method of claim 13 , wherein the transmitting comprises transmitting a data channel in the subframe in which SRS is scheduled such that symbols in the subframe in which SRS is scheduled are code division multiplexed with symbols transmitted by the second apparatus.

15. The method of claim 14 , wherein transmitting the data channel in the subframe in which SRS is scheduled further comprises transmitting at least a first symbol at the lower frequency tone spacing scheme and a second symbol at the higher frequency tone spacing scheme.

16. The method of claim 9 , further comprising:
determining a sounding reference signal (SRS) is scheduled for transmission in a third subframe; and
determining a comb pattern such that a tone used by the SRS may be avoided when transmitting the uplink data channel.

17. The method of claim 9 , wherein the transmitting comprises transmitting the uplink data channel with a higher frequency tone spacing scheme based on a number of previous symbols transmitted with a lower frequency tone spacing.

18. The method of claim 17 , wherein the lower frequency tone spacing scheme comprises a 3.75 kHz tone spacing and the higher frequency tone spacing scheme comprises a 7.5 kHz tone spacing.

19. A first apparatus for wireless communications, comprising:
at least one processor; and
memory coupled with the at least one processor, the memory storing instructions for the at least one processor to cause the first apparatus to:
determine a number of pilot symbols to transmit for one or more slots of a first subframe based, at least in part, on a type of coverage, wherein the number of pilot symbols comprises at least three pilot symbols for a first type of coverage; and
transmit at least one uplink data channel having the determined number of pilot symbols in the one or more slots of the first subframe.

20. A non-transitory computer-readable medium storing instructions for wireless communications, the instructions executable by at least one processor of a first apparatus to:
determine a number of pilot symbols to transmit for one or more slots of a first subframe based, at least in part, on a type of coverage, wherein the number of pilot symbols comprises at least three pilot symbols for a first type of coverage; and
transmit at least one uplink data channel having the determined number of pilot symbols in the one or more slots of the first subframe.

Assignees

• Qualcomm Inc

Inventors

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

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