# US 2019/0173659 A1 · Method and apparatus for channel mapping and detecting base station and user equipment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173659 A1 - Document ID: US20190173659A1 - Status: Published application - Kind: A1 - Application number: 16/323,241 - Filed: 2017-08-04 - Published: 2019-06-06 - Earliest claimed: 2016-08-05 - Assignees: Ntt Docomo, Inc. - Applicants: Ntt Docomo Inc. - Inventors: Jiahui LIU; Qin MU; Liu LIU; Huiling JIANG - Web page: https://patentgrep.com/patent/US20190173659A1 ## CPC - H04L 5/1469: {using time-sharing} - H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication - H04W 56/001: {Synchronization between nodes} - H04W 72/00: Local resource management - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present invention relates to a method and device for mapping a channel in a time division duplex (TDD) mode, a base station using the method and device for mapping a channel, a method and device for detecting a channel for a user equipment in a time division duplex (TDD) mode, and a user equipment using the method and device for detecting a channel. The method for mapping a channel in the time division duplex (TDD) mode includes: on a first carrier frequency, alternately mapping a first broadcast channel and a second broadcast channel onto the sixth subframe of a plurality of subframes included in each frame configured for uplink-downlink in the TDD mode, and mapping a third broadcast channel onto the first subframe of the plurality of subframes; and on a second carrier frequency, mapping the first broadcast channel onto the sixth subframe, at every other frame. ## Claims ### Claim 1 (canceled) ### Claim 2 (canceled) ### Claim 3 (canceled) ### Claim 4 A channel mapping apparatus for a time division duplex (TDD) mode, comprising: a first mapping unit configured to, on a first carrier frequency, alternatively map a first broadcast channel and a second broadcast channel to a sixth subframe among a plurality of subframes included in each frame of uplink-downlink configuration for the TDD mode, and map a third broadcast channel to a first subframe among the plurality of subframes; and a second mapping unit configured to, on a second carrier frequency, map the first broadcast channel to the sixth subframe every other frame. ### Claim 5 (depends on 4) The channel mapping apparatus according to claim 4, wherein there is a predetermined frequency offset between the first carrier frequency and the second carrier frequency. ### Claim 6 (depends on 4) The channel mapping apparatus according to claim 4, wherein the first broadcast channel, the second broadcast channel, and the third broadcast channel are a primary synchronization channel, a secondary synchronization channel, and a physical broadcast channel, respectively. ### Claim 7 (depends on 4) A base station for a time division duplex (TDD) mode, comprising the channel mapping apparatus according to claim 4. ### Claim 8 A channel detecting method in a user equipment for a time division duplex (TDD) mode, comprising: scanning a received frame of uplink-downlink configuration for the TDD mode at a predetermined bandwidth until a first broadcast channel is detected at a specific carrier frequency; and scanning a next frame of the received frame at the specific carrier frequency, wherein in a case where a second broadcast channel is detected in the next frame, the specific carrier frequency is a first carrier frequency, and the next frame is scanned at the first carrier frequency to detect a third broadcast channel; in a case where the second broadcast channel is not detected in the next frame, the specific carrier frequency is a second carrier frequency, the next frame is scanned at the first carrier frequency to detect the second broadcast channel, and the next frame is scanned at the first carrier frequency to detect the third broadcast channel. ### Claim 9 (depends on 8) The channel detecting method according to claim 8, wherein there is a predetermined frequency offset between the first carrier frequency and the second carrier frequency. ### Claim 10 (depends on 8) The channel detecting method according to claim 8, wherein the first broadcast channel and the second broadcast channel are alternately in a sixth subframe among a plurality of subframes included in each frame of the first carrier frequency, the third broadcast channel is in a first subframe among the plurality of subframes, and the first broadcast channel is in a sixth subframe among a plurality of subframes of the second carrier frequency every other frame. ### Claim 11 (depends on 8) The channel detecting method according to claim 8, wherein the first broadcast channel, the second broadcast channel, and the third broadcast channel are a primary synchronization channel, a secondary synchronization channel, and a physical broadcast channel, respectively. ### Claim 12 A channel detecting apparatus for a time division duplex (TDD) mode, comprising: a receiving unit configured to receive a signal frame of uplink-downlink configuration for the TDD mode; and a channel detecting unit configured to scan a received frame of uplink-downlink configuration for the TDD mode at a predetermined bandwidth until a first broadcast channel is detected at a specific carrier frequency, and scan a next frame of the received frame at the specific carrier frequency, wherein in a case where a second broadcast channel is detected in the next frame, the specific carrier frequency is a first carrier frequency, and the next frame is scanned at the first carrier frequency to detect a third broadcast channel; in a case where the second broadcast channel is not detected in the next frame, the specific carrier frequency is a second carrier frequency, the next frame is scanned at the first carrier frequency to detect the second broadcast channel, and the next frame is scanned at the first carrier frequency to detect the third broadcast channel. ### Claim 13 (depends on 12) The channel detecting apparatus according to claim 12, wherein there is a predetermined frequency offset between the first carrier frequency and the second carrier frequency. ### Claim 14 (depends on 12) The channel detecting apparatus according to claim 12, wherein the first broadcast channel and the second broadcast channel are alternately in a sixth subframe among a plurality of subframes included in each frame of the first carrier frequency, the third broadcast channel is in a first subframe among the plurality of subframes, and the first broadcast channel is in a sixth subframe among a plurality of subframes of the second carrier frequency every other frame. ### Claim 15 (depends on 12) The channel detecting apparatus according to claim 12, wherein the first broadcast channel, the second broadcast channel, and the third broadcast channel are a primary synchronization channel, a secondary synchronization channel, and a physical broadcast channel, respectively. ### Claim 16 (depends on 12) A user equipment for a time division duplex (TDD) mode, comprising the channel detecting apparatus according to claim 12.