Method, base station, and user equipment for determining channel loss

1. A non-transitory computer-readable medium storing instructions which, when executed by a processor in a network device, cause the network device to:

send radio resource control common signaling to a terminal device, wherein the radio resource control common signaling indicates that there are N ranks of channel loss extent, each rank has a corresponding number of random access preamble repetitions, and N≥1;

receive, in an enhanced random access opportunity, from the terminal device, one or more transmissions of a random access preamble in a first number of repetitions of the random access preamble, wherein the enhanced random access opportunity embodies a time and/or frequency resource location of a repeated random access preamble; and

determine a rank of the channel loss extent according to the received random access preamble;

wherein a channel loss is a reference signal received power (RSRP).

2. The non-transitory computer-readable medium according to claim 1 , wherein in determining the rank of channel loss extent according to the received random access preamble, the instructions cause the network device to:

determine a random access preamble group in which the received random access preamble is located; and

determine the rank of channel loss extent according to a correspondence between the random access preamble group and the rank of channel loss extent.

3. The non-transitory computer-readable medium according to claim 1 , wherein in determining the rank of channel loss extent according to the received random access preamble, the instructions cause the network device to:

determine the rank of channel loss extent according to a correspondence between the first number of repetitions of the received random access preamble and the rank of channel loss extent.

4. The non-transitory computer-readable medium according to claim 1 , wherein the random access preamble group is one of N random access preamble groups that are determined for the terminal device, and wherein all random access preambles comprised in the N random access preamble groups are used for contention.

5. The non-transitory computer-readable medium according to claim 1 , wherein the terminal device is a machine type communications (MTC) terminal;

wherein the random access preamble group is one of N random access preamble groups that are determined for the terminal device;

wherein all random access preambles comprised in the N random access preamble groups, except in a random access preamble group A and a random access preamble group B, are used for contention; and

wherein random access preambles in the random access preamble group A and the random access preamble group B are used for contention-based random access by a terminal device that is not a MTC terminal.

6. The non-transitory computer-readable medium according to claim 1 , wherein the radio resource control common signaling comprises one or both of the following:

a parameter that is used to indicate the value of N;

a threshold parameter that is used by the terminal device to determine the N ranks.

7. The non-transitory computer-readable medium according to claim 1 , further storing instructions which, when executed by the processor in the network device, cause the network device to:

after determining the rank of channel loss extent, determine a second number of repetitions corresponding to the determined rank of channel loss extent;

wherein the second number of repetitions is for sending downlink information.

8. The non-transitory computer-readable medium according to claim 7 , wherein the downlink information is carried in at least one of the following:

a physical downlink control channel,

a random access response message,

a contention resolution message, or

a unicast physical downlink shared channel.

9. The non-transitory computer-readable medium according to claim 1 , further storing instructions which, when executed by the processor of the network device, cause the network device to:

after determining the rank of channel loss extent, determine a second number of repetitions corresponding to the determined rank of channel loss extent;

wherein the second number of repetitions is for receiving uplink information.

10. The non-transitory computer-readable medium according to claim 9 , wherein the uplink information is carried in a physical uplink shared channel, or a physical uplink control channel.

11. A non-transitory computer-readable medium storing instructions which, when executed by a processor in a terminal device, cause the terminal device to:

receive a radio resource control common signaling from a network device, wherein the radio resource control common signaling indicates that there are N ranks of channel loss extent, each rank has a corresponding number of random access preamble repetitions, and N≥1;

determine the rank of channel loss extent according to a reference signal received power (RSRP);

determine a first number of repetitions of a random access preamble in an enhanced random access opportunity corresponding to the rank of channel loss extent, wherein the enhanced random access opportunity embodies a time and/or frequency resource location of a repeated random access preamble;

send the random access preamble according to the determined first number of repetitions of the random access preamble to the network device.

12. The non-transitory computer-readable medium according to claim 11 , further storing instructions which, when executed by the processor of the terminal device, cause the terminal device to:

select the random access preamble from a random access preamble group that corresponds to the rank of the channel loss extent.

13. The non-transitory computer-readable medium according to claim 11 , wherein the random access preamble group is one of N random access preamble groups that are determined for the terminal device, and wherein all random access preambles comprised in the N random access preamble groups are used for contention.

14. The non-transitory computer-readable medium according to claim 11 , wherein the terminal device is a machine type communications (MTC) terminal;

wherein the random access preamble group is one of N random access preamble groups that are determined for the terminal device;

wherein all random access preambles comprised in the N random access preamble groups, except in a random access preamble group A and a random access preamble group B, are used for contention; and

wherein random access preambles in the random access preamble group A and the random access preamble group B are used for contention-based random access by a terminal device that is not a MTC terminal.

15. The non-transitory computer-readable medium according to claim 11 , wherein the radio resource control common signaling comprises one or both of the following:

a parameter that is used to indicate the value of N;

a threshold parameter that is used by the terminal device to determine the N ranks.

16. The non-transitory computer-readable medium according to claim 11 , further storing instructions which, when executed by the processor of the terminal device, cause the terminal device to:

after determining the rank of channel loss extent, determine a second number of repetitions corresponding to the determined rank of channel loss extent, wherein the second number of repetitions is for the transceiver to receiving downlink.

17. The non-transitory computer-readable medium according to claim 16 , wherein the downlink information is carried in at least one of the following:

a physical downlink control channel,

a random access response message,

a contention resolution message, or

a unicast physical downlink shared channel.

18. The non-transitory computer-readable medium according to claim 11 , further storing instructions which, when executed by the processor of the terminal device, cause the terminal device to:

after determining the rank of channel loss extent, determine a second number of repetitions corresponding to the determined rank of channel loss extent;

wherein the second number of repetitions is for sending uplink information.

19. The non-transitory computer-readable medium according to claim 18 , wherein the uplink information is carried in a physical uplink shared channel, or a physical uplink control channel.