Channel raster and synchronization signal raster for NR unlicensed spectrum

Patent metadata

Field	Value
Publication number	US-12185262-B2
Application number	US-202017593080-A
Country	US
Kind code	B2
Filing date	May 13, 2020
Priority date	May 14, 2019
Publication date	Dec 31, 2024
Grant date	Dec 31, 2024

Abstract

Systems and methods for determining channel raster(s) and synchronization signal raster(s) for New Radio (NR) unlicensed spectrum are disclosed herein. For each of a plurality of data objects an NR channel raster position is determined using Absolute Radio Frequency Channel Number (NR-ARFCN) numbers. For each corresponding NR channel. Global Synchronization Channel Numbers (GSCNs), a number of Physical Resource Blocks (PRBs) based on channel subcarrier spacing (SCS). NR channel raster position placement, channel edges, synchronization signal and physical broadcast channel (SSB) edges, and an SSB raster position are calculated. The plurality of data objects may then be down selected based on e.g., corresponding Long Term Evolution (LTE) channel raster positions and/or entries of a second plurality of data objects calculated for NR channels that use a second SCS.

First claim

The invention claimed is:

1. An apparatus for a transceiver configured for multiple cell communication through a plurality of New Radio (NR) channels, the apparatus for determining a plurality of data objects, each data object corresponding to an NR channel using a first subcarrier spacing (SCS) and comprising an NR channel raster position and an Synchronization Signal and Physical Broadcast Channel (SSB) raster position for each NR channel, the apparatus comprising:
a processor; and
a memory storing instructions that, when executed by the processor, configure the apparatus to:
determine, for each data object, the NR channel raster position, wherein the NR channel raster position comprises a Radio Frequency (RF) reference frequency calculated using an Absolute Radio Frequency Channel Number (NR-ARFCN);
remove, from the plurality of data objects, each data object that comprises an NR channel raster position that does not match an NR channel raster position of any data object of a second plurality of data objects, the second plurality of data objects each corresponding to an NR channel using a second SCS;
calculate Global Synchronization Channel Number (GSCN) values for the NR channel corresponding to each data object;
determine a number of Physical Resource Blocks (PRBs) of the NR channel (N RB ) corresponding to each data object based on the first SCS and a bandwidth of the given NR channel;
determine a placement for the NR channel raster position of each data object;
compute edges of each NR channel corresponding to each data object based on a center frequency of the given NR channel and the placement of the NR channel raster position of the data object;
calculate the edges of an SSB of the NR channel corresponding to each data object based on the edges of the given NR channel;
determine the SSB raster position of each data object based on the edges of the SSB of the NR channel corresponding to the data object; and
perform the multiple cell communication, through the transceiver, using the plurality of NR channels based on the plurality of data objects.

2. The apparatus of claim 1 , wherein the instructions, when executed by the processor, further configure the apparatus to remove, from the plurality of data objects, all but a remaining one of the plurality of data objects that comprise an NR channel raster position corresponding to a same Long Term Evolution (LTE) channel raster position.

3. The apparatus of claim 2 , wherein the remaining one of the plurality of data objects that comprises an NR channel raster position that corresponds to the same LTE channel raster position is selected to remain because the N RB of the NR channel corresponding to the data object that is equal to or greater than an N RB of the NR channel corresponding to each of the other of the plurality of data objects that comprise an NR channel raster position that corresponds to the same LTE channel raster position.

4. The apparatus of claim 1 , wherein the RF reference frequencies are calculated using a formula
F REF =F REF-Offs +ΔF Global ( N REF −N REF-Offs )
wherein:
F REF is the given RF reference frequency;
F REF-Offs is a reference frequency offset;
ΔF Global is a granularity of a global frequency raster;
N REF is the NR-ARFCN for the given reference frequency; and
N REF -Offs is an NR-ARFCN offset.

5. The apparatus of claim 1 , wherein the N RBS are determined according to the following table:

5
10
15
20
25
30
40
50
60
80
90
100

SCS
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz

(kHz)
N RB
N RB
N RB
N RB
N RB
N RB
N RB
N RB
N RB
N RB
N RB
N RB

15
25
52
79
106
133
160
216
270
N/A
N/A
N/A
N/A

30
11
24
38
51
65
78
106
133
162
217
245
273 

60
N/A
11
18
24
31
38
51
65
79
107
121
135.

6. The apparatus of claim 1 , wherein the placement of the NR channel raster position of each data object comprises:
a physical resource block (PRB) number of a PRB of the NR channel corresponding to the data object comprising the NR channel raster position; and
a resource element index for a resource element corresponding to the NR channel raster position within the PRB.

7. The apparatus of claim 6 , wherein the resource element index for the resource element corresponding to the NR channel raster position within the PRB is determinable based on whether the number of PRBs for the NR channel corresponding to the data object comprising the NR channel raster position is even or odd.

8. The apparatus of claim 1 , wherein the instructions, when executed by the processor, further configure the apparatus to:
calculate an Occupied Channel BW (OCB) of each NR channel corresponding to each data object; and
determine whether a minimum guardband is available for each NR channel corresponding to each data object on both edges of the OCB of the given channel.

9. A method for communication through a transceiver based on determining a plurality of data objects, each data object corresponding to a New Radio (NR) channel using a first subcarrier spacing (SCS) and comprising an NR channel raster position and

Assignees

• Apple Inc

Inventors

• Tang Yang
• Lee Dae Won
• Rane Prerana
• Mondal Bishwarup
• Kim Jiwoo
• Kwak Yongjun
• Han Suenghee

Classifications

• H04L27/2607

  Cyclic extensions · CPC title

• H04L27/26025

  Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003) · CPC title

• H04L5/001

  the frequencies being arranged in component carriers · CPC title

• H04L27/261

  Details of reference signals · CPC title

• H04L5/005

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title