System information block transmission method and communication apparatus

A system information block transmission method, comprising:

• receiving, by a terminal device from a network device through a first bandwidth part, a system information block;
• storing, by the terminal device, the system information block and starting a timer, wherein the timer is set to run for a specified duration;
• receiving, by the terminal device from the network device through a second bandwidth part, the system information block when the timer expires, wherein the system information block is included in first dedicated signaling, and configuration information for sending the system information block by the network device is not configured on the second bandwidth part;
• and
• sending, by the terminal device to the network device, first indication information when the timer expires, wherein the first indication information indicates that the system information block stored in the terminal device is about to expire.

A communication apparatus, comprising:

• a non-transitory memory storage comprising instructions;
• and
• one or more processors in communication with the memory storage, wherein the instructions, when executed by the one or more processors, cause the communication apparatus to:
• send a system information block to a terminal device through a first bandwidth part, wherein:
• when determining that a first moment satisfying a preset condition has been attained, send the system information block to the terminal device through a second bandwidth part, wherein the system information block is included in first dedicated signaling, and configuration information for sending the system information block by the network device is not configured on the second bandwidth part;
• and wherein:
• determining that a first moment satisfying a preset condition is reached comprises:
• receive first indication information from the terminal device, wherein the first indication information indicates that the system information block stored in the terminal device is about to expire;
• and
• determine the first moment based on the first indication information.

A communication apparatus, comprising:

• a non-transitory memory storage comprising instructions;
• and
• one or more processors in communication with the memory storage, wherein the instructions, when executed by the one or more processors, cause the communication apparatus to:
• receive a system information block from a network device through a first bandwidth part;
• store the system information block and start a timer, wherein the timer is set to run for a specified duration;
• receive the system information block from the network device through a second bandwidth part when the timer expires, wherein the system information block is included in first dedicated signaling, and configuration information for sending the system information block by the network device is not configured on the second bandwidth part;
• and
• send first indication information to the network device when the timer expires, wherein the first indication information indicates that the system information block stored in the terminal device is about to expire.