METHOD FOR INDICATING PHYSICAL CELL IDENTIFIER AND APPARATUS

• US 20180027482A1
• Filed: 09/29/2017
• Published: 01/25/2018
• Est. Priority Date: 03/31/2015
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Jin, Zhe, Yu, Guangwei, Luo, Zhihu
• Granted Patent: US 10,448,315 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information

Abstract

Embodiments of the present invention provide a method for indicating a physical cell identifier and an apparatus, and relate to the field of communications technologies. The method includes determining, by the terminal device according to a first broadcast message sent by the base station, a PCI of a target cell in which the terminal device is located and determining a first scrambling code according to the PCI of the target cell. The method also includes determining an extended PCI of the target cell according to a second broadcast message sent by the base station and the first scrambling code.

Claims

1. A method comprising:

determining, by a terminal device, according to a first broadcast message sent by a base station, a physical cell identifier (PCI) of a target cell in which the terminal device is located;

determining, by the terminal device, a first scrambling code according to the PCI of the target cell; and

determining, by the terminal device, an extended PCI of the target cell according to a second broadcast message sent by the base station and the first scrambling code, wherein the extended PCI identifies the target cell alone or in combination with the PCI of the target cell.

2. The method according to claim 1, wherein the method further comprises:

determining, by the terminal device, a second scrambling code according to the extended PCI, after determining the extended PCI of the target cell, in response to the extended PCI identifying the target cell, wherein the second scrambling code is for decoding data received from the base station; and

determining, by the terminal device, the second scrambling code according to the combination of the extended PCI and according the PCI of the target cell, after determining the extended PCI of the target cell, in response to the combination of the extended PCI and the PCI of the target cell identifying the target cell, wherein the second scrambling code is for decoding data received from the base station.

3. The method according to claim 1, wherein the extended PCI is a cell identity of a global cell identity alone or in combination with some or all bits of a location area identity of the global cell identity.

4. The method according to claim 1, wherein the first broadcast message comprises a primary synchronization signal (PSS) sequence and a secondary synchronization signal (SSS) sequence that indicate the PCI of the target cell;

and

wherein determining the PCI of the target cell in which the terminal device is located comprises performing, by the terminal device, time-frequency synchronization according to the PSS sequence and according to the SSS sequence, to determine the PCI of the target cell.

5. The method according to claim 1, wherein 36 PCIs are preconfigured in the terminal device or in the base station, wherein the 36 PCIs are indicated by a combination of 3 PSS sequences and 12 SSS sequences.

6. A method comprising:

sending, by a base station, a first broadcast message, wherein the first broadcast message carries a physical cell identifier (PCI) information of a target cell; and

sending, by the base station, a second broadcast message, wherein the second broadcast message carries an extended PCI of the target cell, and wherein the extended PCI identifies the target cell alone or in combination with a PCI of the target cell identifies the target cell; and

wherein the PCI of the target cell corresponds to a first scrambling code sequence, and wherein the extended PCI of the second broadcast message is scrambled using the first scrambling code sequence.

7. The method according to claim 6:

wherein the base station scrambles, according to a second scrambling code, data transmitted in the target cell;

wherein the extended PCI corresponds to the second scrambling code, in response to the extended PCI identifying the target cell; and

wherein a combination of the extended PCI and the PCI corresponds to the second scrambling code, in response to the combination of the extended PCI and the PCI of the target cell identifying the target cell.

8. The method according to claim 6, wherein the extended PCI is a cell identity of a global cell identity alone or in combination with some or all bits of a location area identity of the global cell identity.

9. The method according to claim 6:

wherein the first broadcast message comprises a primary synchronization signal (PSS) sequence and a secondary synchronization sequence (SSS) sequence indicating the PCI of the target cell; and

wherein 36 PCIs are preconfigured in the base station, and wherein the 36 PCIs are indicated by a combination of 3 PSS sequences and 12 SSS sequences.

10. A terminal device, comprising:

a processor; and

a non-transitory computer readable storage medium storing a program for execution by the processor, the program including instructions to;

determine, according to a first broadcast message sent by a base station, a physical cell identifier (PCI) of a target cell in which the terminal device is located;

determine a first scrambling code according to the PCI of the target cell; and

determine an extended PCI of the target cell according to a second broadcast message sent by the base station and according to the first scrambling code, wherein the extended PCI identifies the target cell alone or in combination with the PCI of the target cell identifies the target cell.

11. The terminal device according to claim 10, wherein the instructions further comprise instructions to:

determine a second scrambling code according to the extended PCI, in response to the extended PCI identifying the target cell, wherein the second scrambling code is for the terminal device decoding data received from the base station; and

determine the second scrambling code according to the combination of the extended PCI and the PCI of the target cell, in response to the combination of the extended PCI and the PCI of the target cell identifying the target cell, wherein the second scrambling code is for the terminal device decoding data received from the base station.

12. The terminal device according to claim 10, wherein the extended PCI is a cell identity of a global cell identity alone or in combination with a global cell identity and some or all bits of a location area identity of the global cell identity.

13. The terminal device according to claim 10, wherein the first broadcast message comprises a primary synchronization signal (PSS) sequence and a secondary synchronization signal (SSS) sequence that indicate the PCI of the target cell;

and

wherein the instructions further comprise instructions to perform time-frequency synchronization according to the PSS sequence and according to the SSS sequence, to determine the PCI of the target cell.

14. The terminal device according to claim 10, wherein 36 PCIs are preconfigured in the terminal device or in the base station, and wherein the 36 PCIs are indicated by a combination of 3 PSS sequences and 12 SSS sequences.

15. A base station, comprising:

a processor; and

a non-transitory computer readable storage medium storing a program for execution by the processor, the program including instructions to;

send a first broadcast message, wherein the first broadcast message carries physical cell identifier (PCI) information of a target cell; and

send a second broadcast message, wherein the second broadcast message carries an extended PCI of the target cell, and wherein the extended PCI identifies the target cell alone or in combination with a PCI of the target cell identifies the target cell; and

wherein the PCI of the target cell corresponds to a first scrambling code sequence, and wherein the extended PCI of the second broadcast message is scrambled using the first scrambling code sequence.

16. The base station according to claim 15, wherein the instructions further comprise instructions to:

scramble, according to a second scrambling code, data transmitted in the target cell;

wherein the extended PCI corresponds to the second scrambling code, in response to the extended PCI identifying the target cell; and

wherein a combination of the extended PCI and the PCI corresponds to the second scrambling code, in response to the combination of the extended PCI and the PCI of the target cell identifying the target cell.

17. The base station according to claim 15, wherein the extended PCI is a cell identity of a global cell identity alone or in combination with some or all bits of a location area identity of the global cell identity.

18. The base station according to claim 15:

wherein the first broadcast message comprises a primary synchronization signal (PSS) sequence and a secondary synchronization sequence (SSS) sequence that indicate the PCI of the target cell; and

wherein 36 PCIs are preconfigured in the base station, and wherein the 36 PCIs are indicated by a combination of 3 PSS sequences and 12 SSS sequences.