Information transmission method and apparatus

An information transmission method, comprising:

• determining whether a trigger condition is met;
• and
• entering a power headroom report (PHR) triggering state when the trigger condition is met, wherein
• the trigger condition comprises any one of the following:
• (1) a first timer expires or has expired, and a path loss change of at least one reference serving downlink beam of a serving cell exceeds a third threshold, wherein the third threshold is a default value or is configured by a network device;
• (2) at least one serving uplink beam of a serving cell is activated, configured, or added;
• (3) the first timer expires or has expired, power back-off occurs on at least one serving uplink beam used as a reference, and a back-off value exceeds a fourth threshold;
• (4) a third timer expires, wherein the third timer is configured to periodically trigger a PHR, and is configured for a beam, and duration of the third timer is a default value or is configured by the network device;
• (5) the first timer expires or has expired, and a path loss change of at least one parameter set used as a reference exceeds a fifth threshold, wherein the fifth threshold is a default value or is configured by the network device, and the parameter set consists of a subcarrier spacing, a cyclic prefix length, and a transmission time interval;
• (6) at least one numerology of a serving cell is activated, added, or configured;
• (7) a fourth timer expires, wherein the fourth timer is configured to periodically trigger a PHR, and is configured for a numerology, and duration of the fourth timer is a default value or is configured by the network device;
• or
• (8) the first timer expires or has expired, power back-off occurs on at least one numerology used as a reference, and a back-off value exceeds a sixth threshold, wherein the sixth threshold is a default value or is configured by the network device.

An apparatus, comprising a processor, wherein the processor is coupled to a memory;

• and
• the processor is configured to execute a program or an instruction stored in the memory, and when the processor executes the instruction stored in the memory, the apparatus is configured to complete the method comprising:
• when a terminal device is in a power headroom report (PHR) triggering state, receiving a first indication from a network device, wherein the first indication is used to indicate a first uplink transmission resource of the terminal device, and the first uplink transmission resource is used by the terminal device to perform uplink transmission with the network device;
• and
• keeping the power headroom report triggering state in a first time period, and canceling the power headroom report triggering state when the first time period expires, wherein
• the first time period is:
• a time period starting from a receiving time point of the first indication to a time point of generating a power headroom report based on a second indication corresponding to a shortest transmission time interval after the second indication is received, wherein the second indication is used to indicate a second uplink transmission resource of the terminal device.