# US 2019/0174437 A1 · Communication method and device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174437 A1 - Document ID: US20190174437A1 - Status: Published application - Kind: A1 - Application number: 16/266,404 - Filed: 2019-02-04 - Published: 2019-06-06 - Earliest claimed: 2016-08-12 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yongxia LYU; Zhiheng GUO - Web page: https://patentgrep.com/patent/US20190174437A1 ## CPC - H04W 56/001: {Synchronization between nodes} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0092: {Indication of how the channel is divided} - H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)} - H04L 27/2646: {using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length} - H04W 72/04: Wireless resource allocation - H04W 74/004: {in the uplink, i.e. towards network} - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/085: {collision avoidance} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract In a communication method disclosed in this application, a terminal device receives, from a network device, a synchronization signal and a system information signal that are generated based on a first subcarrier spacing. The terminal device sends a random access request signal to the network device based on a second subcarrier spacing and a first transmission resource, where a type of the first transmission resource corresponds to a third subcarrier spacing and/or a fourth subcarrier spacing. The terminal device further receives a random access response signal generated based on the fourth subcarrier spacing, where the random access response signal is used for instructing the terminal device to access a network or the random access response signal is used for instructing the terminal device to prepare to access network. Thereby, cell search for and random access to a network using a plurality of subcarrier spacings can be supported. ## Claims ### Claim 1 A communication method, comprising: receiving, by a terminal device from a network device, a synchronization signal and a system information signal that are generated based on a first subcarrier spacing, wherein the system information signal comprises indication information used for indicating a second subcarrier spacing, and the second subcarrier spacing is a subcarrier spacing used by the terminal device to send a random access request signal; sending, by the terminal device, the random access request signal to the network device based on the second subcarrier spacing and a first transmission resource, wherein a type of the first transmission resource corresponds to a third subcarrier spacing and/or a fourth subcarrier spacing, the third subcarrier spacing is a subcarrier spacing used by the terminal device to send an uplink signal, and the fourth subcarrier spacing is a subcarrier spacing used by the terminal device to monitor a downlink signal; and receiving, by the terminal device from the network device, a random access response signal generated based on the fourth subcarrier spacing, wherein the random access response signal is used for instructing the terminal device to access a network or the random access response signal is used for instructing the terminal device to prepare to access a network. ### Claim 2 (depends on 1) The method according to claim 1, wherein when the random access response signal indicates that the terminal device is to prepares to access the network, the random access response signal further comprises indication information used for indicating a second transmission resource, the second transmission resource is used for transmitting the uplink signal, the method further comprising: sending, by the terminal device based on the second transmission resource and the third subcarrier spacing, a signal comprising a message 3 to the network device, wherein the message 3 comprises identification information of the terminal device; and receiving, by the terminal device from the network device, an access acknowledgement signal generated based on the fourth subcarrier spacing, wherein the access acknowledgement signal is used for instructing the terminal device to access the network. ### Claim 3 (depends on 2) The method according to claim 2, further comprising: receiving, by the terminal device, configuration information from the network device, wherein the configuration information is used for configuring a fifth subcarrier spacing, and the fifth subcarrier spacing is a subcarrier spacing used after the terminal device accesses the network. ### Claim 4 (depends on 3) The method according to claim 3, wherein the configuration information is carried in the access acknowledgement signal. ### Claim 5 (depends on 1) The method according to claim 1, wherein the random access request signal comprises a preamble sequence, and a type of the preamble sequence corresponds to the third subcarrier spacing and/or the fourth subcarrier spacing. ### Claim 6 A communication method, comprising: sending, by a network device, a synchronization signal and a system information signal that are generated based on at least two types of subcarrier spacings, wherein the system information signal comprises indication information used for indicating a second subcarrier spacing, and the second subcarrier spacing is a subcarrier spacing used by a terminal device to send a random access request signal; receiving, by the network device from the terminal device by using a first transmission resource, the random access request signal generated based on the second subcarrier spacing, wherein a type of the first transmission resource corresponds to a third subcarrier spacing and/or a fourth subcarrier spacing, the third subcarrier spacing is a subcarrier spacing used by the terminal device to send an uplink signal, and the fourth subcarrier spacing is a subcarrier spacing used by the terminal device to monitor a downlink signal; and sending, by the network device to the terminal device, a random access response signal generated based on the fourth subcarrier spacing, wherein the random access response signal is used for instructing the terminal device to access a network or the random access response signal is used for instructing the terminal device to prepare to access a network. ### Claim 7 (depends on 6) The method according to claim 6, wherein when the random access response signal indicates that the terminal device is to prepares to access the network, the random access response signal further comprises indication information used for indicating a second transmission resource, the second transmission resource is used for transmitting the uplink signal, the method further comprising: receiving, by the network device from the terminal device by using the second transmission resource, a signal that comprises a message 3 and that is generated based on the third subcarrier spacing, wherein the message 3 comprises identification information of the terminal device; determining, by the network device based on the identification information, that the terminal device accesses the network; and sending, by the network device, an access acknowledgement signal to the terminal device based on the fourth subcarrier spacing, wherein the access acknowledgement signal is used for indicating that the terminal device accesses the network. ### Claim 8 (depends on 7) The method according to claim 7, further comprising: sending, by the network device, configuration information to the terminal device, wherein the configuration information is used for configuring a fifth subcarrier spacing, and the fifth subcarrier spacing is a subcarrier spacing used after the terminal device accesses the network. ### Claim 9 (depends on 8) The method according to claim 8, wherein the configuration information is carried in the access acknowledgement signal. ### Claim 10 (depends on 8) The method according to claim 8, wherein the fifth subcarrier spacing comprises at least two types of subcarrier spacings. ### Claim 11 (depends on 6) The method according to claim 6, wherein the random access request signal comprises a preamble sequence, and a type of the preamble sequence corresponds to the third subcarrier spacing and/or the fourth subcarrier spacing. ### Claim 12 A terminal device, comprising a processor and a transceiver, wherein the transceiver is configured to: receive, from a network device, a synchronization signal and a system information signal that are generated based on a first subcarrier spacing, wherein the system information signal comprises indication information used for indicating a second subcarrier spacing, and the second subcarrier spacing is a subcarrier spacing used by the terminal device to send a random access request signal; the transceiver is configured to: send the random access request signal to the network device based on the second subcarrier spacing and a first transmission resource, wherein a type of the first transmission resource corresponds to a third subcarrier spacing and/or a fourth subcarrier spacing, the third subcarrier spacing is a subcarrier spacing used by the terminal device to send an uplink signal, and the fourth subcarrier spacing is a subcarrier spacing used by the terminal device to monitor a downlink signal; and the transceiver is configured to: receive, from the network device, a random access response signal generated based on the fourth subcarrier spacing, wherein the random access response signal is used for instructing the terminal device to access a network or the random access response signal is used for instructing the terminal device to prepare to access a network. ### Claim 13 (depends on 12) The terminal device according to claim 12, wherein when the random access response signal indicates that the terminal device is to prepare to access the network, the random access response signal further comprises indication information used for indicating a second transmission resource, the second transmission resource is used for transmitting the uplink signal, and the transceiver is further configured to: send, based on the second transmission resource and the third subcarrier spacing, a signal comprising a message 3 to the network device, wherein the message 3 comprises identification information of the terminal device; and receive, from the network device, an access acknowledgement signal generated based on the fourth subcarrier spacing, wherein the access acknowledgement signal is used for instructing the terminal device to access the network. ### Claim 14 (depends on 13) The terminal device according to claim 13, wherein the transceiver is further configured to receive configuration information from the network device, wherein the configuration information is used for configuring a fifth subcarrier spacing, and the fifth subcarrier spacing is a subcarrier spacing used after the terminal device accesses the network. ### Claim 15 (depends on 14) The terminal device according to claim 14, wherein the configuration information is carried in the access acknowledgement signal. ### Claim 16 (depends on 12) The terminal device according to claim 12, wherein the random access request signal comprises a preamble sequence, and a type of the preamble sequence corresponds to the third subcarrier spacing and/or the fourth subcarrier spacing. ### Claim 17 A network device, comprising a processor and a transceiver, wherein the transceiver is configured to: send a synchronization signal and a system information signal that are generated based on at least two types of subcarrier spacings, wherein the synchronization signal is used for a terminal device to receive the system information signal, the system information signal comprises indication information used for indicating a second subcarrier spacing, and the second subcarrier spacing is a subcarrier spacing used by the terminal device to send a random access request signal; the transceiver is further configured to: receive, from the terminal device by using a first transmission resource, the random access request signal generated based on the second subcarrier spacing, wherein a type of the first transmission resource corresponds to a third subcarrier spacing and/or a fourth subcarrier spacing, the third subcarrier spacing is a subcarrier spacing used by the terminal device to send an uplink signal, and the fourth subcarrier spacing is a subcarrier spacing used by the terminal device to monitor a downlink signal; and the transceiver is further configured to: send, to the terminal device, a random access response signal generated based on the fourth subcarrier spacing, wherein the random access response signal is used for instructing the terminal device to access a network or the random access response signal is used for instructing the terminal device to prepare to access a network. ### Claim 18 (depends on 17) The network device according to claim 17, wherein when the random access response signal indicates that the terminal device prepares to access the network, the random access response signal further comprises indication information used for indicating a second transmission resource, the second transmission resource is used for transmitting the uplink signal, and the transceiver is further configured to: receive, from the terminal device by using the second transmission resource, a signal that comprises a message 3 and that is generated based on the third subcarrier spacing, wherein the message 3 comprises identification information of the terminal device; the processor is configured to: determine, based on the identification information, that the terminal device accesses the network; and cause the transceiver to send an access acknowledgement signal to the terminal device based on the fourth subcarrier spacing, wherein the access acknowledgement signal is used for instructing the terminal device to access the network. ### Claim 19 (depends on 18) The network device according to claim 18, wherein the transceiver is further configured to send configuration information to the terminal device, wherein the configuration information is used for configuring a fifth subcarrier spacing, and the fifth subcarrier spacing is a subcarrier spacing used after the terminal device accesses the network. ### Claim 20 (depends on 19) The network device according to claim 19, wherein the configuration information is carried in the access acknowledgement signal.