# US 2019/0173600 A1 · Information Transmission Method, Terminal, and Network Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173600 A1 - Document ID: US20190173600A1 - Status: Published application - Kind: A1 - Application number: 16/271,175 - Filed: 2019-02-08 - Published: 2019-06-06 - Earliest claimed: 2016-08-11 - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yan Cheng - Web page: https://patentgrep.com/patent/US20190173600A1 ## CPC - 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} - H04J 11/0079: {Acquisition of downlink reference signals, e.g. detection of cell-ID} - H04W 48/10: using broadcasted information - H04W 56/00: Synchronisation arrangements - H04W 56/0015: {one node acting as a reference for the others} - 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) - 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 this application provide an information transmission method, a terminal, and a network device. The information transmission method in this application may include: determining, by a terminal, a subcarrier spacing corresponding to a synchronization signal, where the subcarrier spacing corresponding to the synchronization signal is a largest subcarrier spacing in a subcarrier spacing set corresponding to a serving cell carrying the synchronization signal; and detecting, by the terminal, the synchronization signal based on the subcarrier spacing corresponding to the synchronization signal. The embodiments of this application can be flexibly applied to different application scenarios. ## Claims ### Claim 1 A method, comprising: determining, by a terminal, a first subcarrier spacing corresponding to a synchronization signal, wherein a subcarrier spacing set corresponds to a serving cell carrying the synchronization signal, and the first subcarrier spacing is a largest subcarrier spacing in the subcarrier spacing set; and detecting, by the terminal, the synchronization signal based on the first subcarrier spacing. ### Claim 2 (depends on 1) The method according to claim 1, wherein a plurality of cyclic prefixes correspond to the first subcarrier spacing, and a first cyclic prefix corresponding to a symbol carrying the synchronization signal is a longest cyclic prefix in the plurality of cyclic prefixes. ### Claim 3 (depends on 1) The method according to claim 1, further comprising: determining, by the terminal based on a sequence corresponding to the synchronization signal, a time-frequency resource carrying system information. ### Claim 4 (depends on 3) The method according to claim 3, wherein: determining, by the terminal based on the sequence corresponding to the synchronization signal, the time-frequency resource carrying the system information comprises: when the sequence corresponding to the synchronization signal is a first sequence, determining, by the terminal, that the time-frequency resource carrying the system information is a first time-frequency resource; or when the sequence corresponding to the synchronization signal is a second sequence, determining, by the terminal, that the time-frequency resource carrying the system information is a second time-frequency resource; a frequency domain location of the first time-frequency resource is the same as a frequency domain location of a time-frequency resource carrying the synchronization signal, or a frequency domain location corresponding to the first time-frequency resource comprises a frequency domain location corresponding to a time-frequency resource carrying the synchronization signal; and a frequency domain location of the second time-frequency resource is adjacent to the frequency domain location of the time-frequency resource carrying the synchronization signal, or a frequency domain location corresponding to the second time-frequency resource and the frequency domain location corresponding to the time-frequency resource carrying the synchronization signal are separated by a fixed frequency shift. ### Claim 5 (depends on 4) The method according to claim 4, wherein: a start symbol of the first time-frequency resource is adjacent to a last symbol carrying the synchronization signal; or a start symbol of the first time-frequency resource is a next symbol of a last symbol carrying the synchronization signal; or when a last symbol carrying the synchronization signal is a symbol l, a start symbol of the first time-frequency resource is a symbol (l+1) or a symbol (l+1)mod L, wherein l=0,1, . . . L−1, and L is a positive integer; and a symbol of the second time-frequency resource is the same as the symbol carrying the synchronization signal; or a start symbol of the second time-frequency resource is the same as a start symbol carrying a primary synchronization signal comprised in the synchronization signal. ### Claim 6 (depends on 5) The method according to claim 5, wherein: the system information comprises a symbol location indicator field; and the symbol location indicator field indicates a location of a start symbol carrying the synchronization signal; or the symbol location indicator field indicates an index of a start symbol carrying the synchronization signal; or the symbol location indicator field indicates a time domain shift between a start symbol carrying the synchronization signal and a first symbol of a subframe carrying the synchronization signal; or the symbol location indicator field indicates a location of the start symbol carrying the primary synchronization signal; or the symbol location indicator field indicates an index of the start symbol carrying the primary synchronization signal; or the symbol location indicator field indicates a time domain shift between the start symbol carrying the primary synchronization signal and a first symbol of a subframe carrying the primary synchronization signal. ### Claim 7 (depends on 4) The method according to claim 4, wherein the frequency domain location of the second time-frequency resource being adjacent to the frequency domain location of the time-frequency resource carrying the synchronization signal comprises: the frequency domain location of the second time-frequency resource being adjacent to the frequency domain location of the time-frequency resource carrying the synchronization signal, and being distributed on two sides of the frequency domain location of the time-frequency resource carrying the synchronization signal. ### Claim 8 (depends on 4) The method according to claim 4, wherein the first sequence is generated in a first combination manner using two 31-bit-length sequences, the second sequence is generated in a second combination manner using the two 31-bit-length sequences, and the first combination manner is different from the second combination manner. ### Claim 9 A method, comprising: determining, by a network device, a first subcarrier spacing corresponding to a synchronization signal, wherein a subcarrier spacing set corresponds to a serving cell carrying the synchronization signal, and the first subcarrier spacing is a largest subcarrier spacing in the subcarrier spacing set; and sending, by the network device, the synchronization signal based on the first subcarrier spacing. ### Claim 10 (depends on 9) The method according to claim 9, wherein before sending, by the network device, the synchronization signal based on the first subcarrier spacing, the method further comprises: determining, by the network device based on the first subcarrier spacing, a cyclic prefix set corresponding to the first subcarrier spacing; and determining, by the network device based on the cyclic prefix set, that a first cyclic prefix corresponding to a symbol carrying the synchronization signal is a longest cyclic prefix in the cyclic prefix set. ### Claim 11 (depends on 10) The method according to claim 10, wherein sending, by the network device, the synchronization signal based on the first subcarrier spacing comprises: sending, by the network device, the synchronization signal based on the first subcarrier spacing and the first cyclic prefix. ### Claim 12 (depends on 9) The method according to claim 9, further comprising: determining, by the network device, a time-frequency resource carrying system information; and determining, by the network device based on the time-frequency resource carrying the system information, a sequence corresponding to the synchronization signal. ### Claim 13 (depends on 12) The method according to claim 12, wherein: determining, by the network device based on the time-frequency resource carrying the system information, a sequence corresponding to the synchronization signal comprises: when the time-frequency resource carrying the system information is a first time-frequency resource, determining, by the network device, that the sequence corresponding to the synchronization signal is a first sequence; or when the time-frequency resource carrying the system information is a second time-frequency resource, determining, by the network device, that the sequence corresponding to the synchronization signal is a second sequence; a frequency domain location of the first time-frequency resource is the same as a frequency domain location of a time-frequency resource carrying the synchronization signal, or a frequency domain location of the first time-frequency resource comprises a frequency domain location of a time-frequency resource carrying the synchronization signal; and a frequency domain location of the second time-frequency resource is adjacent to the frequency domain location of the time-frequency resource carrying the synchronization signal, or a frequency domain location of the second time-frequency resource and the frequency domain location of the time-frequency resource carrying the synchronization signal are separated by a fixed frequency shift. ### Claim 14 (depends on 13) The method according to claim 13, wherein: a start symbol of the first time-frequency resource is adjacent to a last symbol carrying the synchronization signal; or a start symbol of the first time-frequency resource is a next symbol of a last symbol carrying the synchronization signal; or when a last symbol carrying the synchronization signal is a symbol l, a start symbol of the first time-frequency resource is a symbol (l+1) or a symbol (l+1)mod L, wherein l=0,1, . . . L−1, and L is a positive integer; and a symbol of the second time-frequency resource is the same as the symbol carrying the synchronization signal; or a start symbol of the second time-frequency resource is the same as a start symbol carrying a primary synchronization signal comprised in the synchronization signal. ### Claim 15 (depends on 13) The method according to claim 13, wherein the frequency domain location of the second time-frequency resource being adjacent to the frequency domain location of the time-frequency resource carrying the synchronization signal comprises: the frequency domain location of the second time-frequency resource being adjacent to the frequency domain location of the time-frequency resource carrying the synchronization signal, and being distributed on two sides of the frequency domain location of the time-frequency resource carrying the synchronization signal. ### Claim 16 (depends on 13) The method according to claim 13, wherein the first sequence is generated in a first combination manner using two 31-bit-length sequences, the second sequence is generated in a second combination manner using the two 31-bit-length sequences, and the first combination manner is different from the second combination manner. ### Claim 17 (depends on 12) The method according to claim 12, wherein: determining, by the network device based on the time-frequency resource carrying the system information, the sequence corresponding to the synchronization signal comprises: when the time-frequency resource carrying the system information is a first time-frequency resource, determining, by the network device, that the sequence corresponding to the synchronization signal is a first sequence; or when the time-frequency resource carrying the system information is a second time-frequency resource, determining, by the network device, that the sequence corresponding to the synchronization signal is a second sequence; and the first time-frequency resource and a time-frequency resource carrying the synchronization signal are subject to time division multiplexing, and the second time-frequency resource and the time-frequency resource carrying the synchronization signal are subject to frequency division multiplexing. ### Claim 18 A terminal, comprising: a receiver, configured to receive information sent by a network device; and at least one processor, configured to: determine a first subcarrier spacing corresponding to a synchronization signal, wherein a subcarrier spacing set corresponds to a serving cell carrying the synchronization signal, and the first subcarrier spacing is a largest subcarrier spacing in the subcarrier spacing set; and detect the synchronization signal based on the first subcarrier spacing corresponding to the synchronization signal and the received information sent by the network device. ### Claim 19 (depends on 18) The terminal according to claim 18, wherein the at least one processor is further configured to determine, based on a sequence corresponding to the synchronization signal, a time-frequency resource carrying system information. ### Claim 20 (depends on 19) The terminal according to claim 19, wherein the at least one processor is configured to: when the sequence corresponding to the synchronization signal is a first sequence, determine that the time-frequency resource carrying the system information is a first time-frequency resource; or when the sequence corresponding to the synchronization signal is a second sequence, determine that the time-frequency resource carrying the system information is a second time-frequency resource; wherein a frequency domain location of the first time-frequency resource is the same as a frequency domain location of a time-frequency resource carrying the synchronization signal, or a frequency domain location corresponding to the first time-frequency resource comprises a frequency domain location corresponding to a time-frequency resource carrying the synchronization signal; and a frequency domain location of the second time-frequency resource is adjacent to the frequency domain location of the time-frequency resource carrying the synchronization signal, or a frequency domain location corresponding to the second time-frequency resource and the frequency domain location corresponding to the time-frequency resource carrying the synchronization signal are separated by a fixed frequency shift.