Method for detecting signal on unlicensed spectrum channel, user equipment, and base station

User equipment comprising:

• a processor;
• and
• a memory storing a program to be executed in the processor, the program comprising instructions for:
• receiving instruction information from a base station, wherein the instruction information comprises a random backoff number;
• determining according to the random backoff number, a time when the base station is permitted to use an unlicensed spectrum channel;
• and
• detecting a signal on the unlicensed spectrum channel according to the time.

A base station comprising:

• a processor;
• and
• a memory storing a program to be executed in the processor, the program comprising instructions for:
• sending instruction information to user equipment (UE), wherein the instruction information comprises a random backoff number, wherein the random backoff number indicates, to the UE, a time when the base station is permitted to use an unlicensed spectrum channel, and wherein the UE detects a signal on the unlicensed spectrum channel according to the time.