An information sending method, comprising: sending, by a terminal device, a first message, MSG1, in a random access procedure, to a network device; generating (S31, S41), by the terminal device , a downlink channel quality report volume, wherein - the downlink channel quality report volume is used to indicate a relative relationship between a first number of repetitions and a second number of repetitions, - the first number of repetitions is a quantity of retransmissions that need to be performed in a first downlink control channel format to achieve a preset block error rate, - the second number of repetitions is a number of repetitions for common search space of a downlink control channel carried on a downlink carrier, and - the downlink carrier is a carrier for receiving a second message, MSG2, in a random access procedure; and sending (S32, S42, S72), by the terminal device , to the network device , a third message, MSG3, in the random access procedure, wherein the MSG3 is used to indicate the downlink channel quality report volume, wherein before a first message, MSG1, in the random access procedure is sent, performing, by the terminal device , measurement on a downlink anchor carrier, to obtain the first number of repetitions, or after a first MSG1 in the random access procedure is sent, performing, by the terminal device , measurement on the downlink carrier for receiving the MSG2 in the random access procedure, to obtain the first number of repetitions. sending, by a terminal device, a first message, MSG1, in a random access procedure, to a network device; generating (S31, S41), by the terminal device , a downlink channel quality report volume, wherein - the downlink channel quality report volume is used to indicate a relative relationship between a first number of repetitions and a second number of repetitions, - the first number of repetitions is a quantity of retransmissions that need to be performed in a first downlink control channel format to achieve a preset block error rate, - the second number of repetitions is a number of repetitions for common search space of a downlink control channel carried on a downlink carrier, and - the downlink carrier is a carrier for receiving a second message, MSG2, in a random access procedure; and - the downlink channel quality report volume is used to indicate a relative relationship between a first number of repetitions and a second number of repetitions, - the first number of repetitions is a quantity of retransmissions that need to be performed in a first downlink control channel format to achieve a preset block error rate, - the second number of repetitions is a number of repetitions for common search space of a downlink control channel carried on a downlink carrier, and - the downlink carrier is a carrier for receiving a second message, MSG2, in a random access procedure; and sending (S32, S42, S72), by the terminal device , to the network device , a third message, MSG3, in the random access procedure, wherein the MSG3 is used to indicate the downlink channel quality report volume, wherein before a first message, MSG1, in the random access procedure is sent, performing, by the terminal device , measurement on a downlink anchor carrier, to obtain the first number of repetitions, or after a first MSG1 in the random access procedure is sent, performing, by the terminal device , measurement on the downlink carrier for receiving the MSG2 in the random access procedure, to obtain the first number of repetitions. <EOS>