# US 2021/0242965 A1 · Error check-based synchronization and broadcast channel

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- Number: US 2021/0242965 A1
- Document ID: US20210242965A1
- Status: Published application
- Kind: A1
- Application number: 17/234,271
- Filed: 2021-04-19
- Published: 2021-08-05
- Earliest claimed: 2017-01-06
- Assignees: IDAC Holdings, Inc.
- Applicants: IDAC Holdings, Inc.
- Inventors: Kyle Jung-Lin Pan; Fengjun Xi
- Web page: https://patentgrep.com/patent/US20210242965A1

## CPC

- H04L 1/0041: {Arrangements at the transmitter end}
- H04L 1/0061: {Error detection codes}
- H04J 11/0073: {Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group}
- H04J 11/0076: {Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group}
- H04L 1/0057: {Block codes (H04L1/0061, H04L1/0064 take precedence)}
- H04L 1/0072: {Error control for data other than payload data, e.g. control data}
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 69/324: in the data link layer [OSI layer 2], e.g. HDLC
- H03M 13/09: Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
- H03M 13/1102: {Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes}
- H03M 13/13: Linear codes
- H03M 13/2957: {Turbo codes and decoding}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04W 48/16: Discovering, processing access restriction or access information
- H04W 56/0015: {one node acting as a reference for the others}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Systems, methods, and instrumentalities are disclosed for error check-based synchronization. Physical Broadcast Channel (PBCH) data may be determined. A scrambling (e.g., a first scrambling) of the PBCH data may be scrambled via a sequence (e.g., a first sequence). The first sequence may be based on a cell ID and/or timing information. Error check bits may be attached to the scrambled PBCH data and to the timing information. The error check bits may include one or more cyclic redundancy check (CRC) bits. The scrambled PBCH data, the timing information (e.g., the unscrambled timing information), and/or the attached error check bits may be polar encoded. The polar encoding may result in polar encoded bits. A scrambling (e.g., a second scrambling) of the polar encoded bits may be scrambled via a sequence (e.g., a second sequence). The first sequence and the second sequence may be different. The polar encoded bits may be transmitted.

## Claims

### Claim at position 1

1-12. (canceled)

### Claim 13

A wireless transmit/receive unit (WTRU), the WTRU comprising:
a processor configured to:
receive a physical broadcast channel (PBCH) transmission;
perform a first descrambling of the PBCH transmission via a first sequence, wherein the performance of the first descrambling results in first bits;
perform polar decoding of the first bits, wherein the performance of the polar decoding results in second bits;
perform a second descrambling of a subset of the second bits; and
determine PBCH data.

### Claim 14 (depends on 13)

The WTRU of claim 13, wherein the subset of the second bits comprise bits associated with scrambled PBCH data.

### Claim 15 (depends on 14)

The WTRU of claim 14, wherein the performance of the second descrambling results in unscrambled PBCH data, and wherein the unscrambled PBCH data is the PBCH data.

### Claim 16 (depends on 13)

The WTRU of claim 13, wherein the first bits comprise polar encoded timing information, polar encoded scrambled PBCH data, and polar encoded CRC bits, and wherein the second bits comprise scrambled PBCH data, unscrambled timing information bits, and CRC bits.

### Claim 17 (depends on 16)

The WTRU of claim 16, wherein the unscrambled timing information bits are associated with at least one of a system frame number, a subset of a system frame number, a half radio frame number, or a synchronization signal (SS) block index.

### Claim 18 (depends on 13)

The WTRU of claim 13, wherein the second descrambling is performed via a second sequence, and wherein the second sequence is a function of a cell ID and timing information.

### Claim 19 (depends on 18)

The WTRU of claim 18, wherein the first sequence and the second sequence are different.

### Claim 20 (depends on 13)

The WTRU of claim 13, wherein the PBCH data is new radio (NR) PBCH data.

### Claim 21 (depends on 13)

The WTRU of claim 13, wherein the subset of the second bits does not include CRC bits.

### Claim 22 (depends on 13)

The WTRU of claim 13, wherein:
the first descrambling comprises application of the first sequence to bits of the PBCH transmission that were scrambled with the first sequence; and
the second descrambling comprises application of a second sequence to bits of the subset of the second bits that were scrambled with the second sequence.

### Claim 23

A method comprising:
receiving a physical broadcast channel (PBCH) transmission;
performing a first descrambling of the PBCH transmission via a first sequence, wherein the performance of the first descrambling results in first bits;
performing polar decoding of the first bits, wherein the performance of the polar decoding results in second bits;
performing a second descrambling of a subset of the second bits; and
determining PBCH data.

### Claim 24 (depends on 23)

The method of claim 23, wherein the subset of the second bits comprise bits associated with scrambled PBCH data.

### Claim 25 (depends on 24)

The method of claim 24, wherein the performance of the second descrambling results in unscrambled PBCH data, and wherein the unscrambled PBCH data is the PBCH data.

### Claim 26 (depends on 23)

The method of claim 23, wherein the first bits comprise polar encoded timing information, polar encoded scrambled PBCH data, and polar encoded CRC bits, and wherein the second bits comprise scrambled PBCH data, unscrambled timing information bits, and CRC bits.

### Claim 27 (depends on 26)

The method of claim 26, wherein the unscrambled timing information bits are associated with at least one of a system frame number, a subset of a system frame number, a half radio frame number, or a synchronization signal (SS) block index.

### Claim 28 (depends on 23)

The method of claim 23, wherein the second descrambling is performed via a second sequence, and wherein the second sequence is a function of a cell ID and timing information.

### Claim 29 (depends on 28)

The method of claim 28, wherein the first sequence and the second sequence are different.

### Claim 30 (depends on 23)

The method of claim 23, wherein the PBCH data is new radio (NR) PBCH data.

### Claim 31 (depends on 23)

The method of claim 23, wherein the subset of the second bits does not include CRC bits.

### Claim 32 (depends on 23)

The method of claim 23, wherein:
the first descrambling comprises application of the first sequence to bits of the PBCH transmission that were scrambled with the first sequence; and
the second descrambling comprises application of a second sequence to bits of the subset of the second bits that were scrambled with the second sequence.