# US 2018/0027482 A1 · Method for indicating physical cell identifier and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0027482 A1 - Document ID: US20180027482A1 - Status: Published application - Kind: A1 - Application number: 15/719,700 - Filed: 2017-09-29 - Published: 2018-01-25 - Earliest claimed: 2015-03-31 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co, Ltd. - Inventors: Zhe Jin; Guangwei Yu; Zhihu Luo - Web page: https://patentgrep.com/patent/US20180027482A1 ## CPC - H04W 48/10: using broadcasted information - H04W 36/0061: {of neighbour cell information} - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04W 48/16: Discovering, processing access restriction or access information - H04W 48/12: using downlink control channel - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## 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 ### Claim 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. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) 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. ### Claim 4 (depends on 1) 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. ### Claim 5 (depends on 1) 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. ### Claim 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. ### Claim 7 (depends on 6) 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. ### Claim 8 (depends on 6) 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. ### Claim 9 (depends on 6) 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. ### Claim 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. ### Claim 11 (depends on 10) 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. ### Claim 12 (depends on 10) 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. ### Claim 13 (depends on 10) 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. ### Claim 14 (depends on 10) 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. ### Claim 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. ### Claim 16 (depends on 15) 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. ### Claim 17 (depends on 15) 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. ### Claim 18 (depends on 15) 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.