Communication method and device

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.

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.

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.