Data transmission method, device, and system
The present disclosure discloses a data transmission method, a device, and a system, relates to the communications field, and can resolve a prior-art problem that a receive end cannot correctly receive data because a starting moment of sending information on a license-exempt spectrum cannot be determined. A specific solution is as follows: A first device detects first information of a first serving cell in a preset time period of a first subframe on a first time resource or a first time set of a subframe on a first time resource, determines a starting position of a second time resource according to the first information, and detects second information of the first serving cell in a second time set of a subframe on the second time resource. The present disclosure is used for data transmission.
1. A device, comprising:
a non-transitory memory storing program instructions; and
at least one processor coupled to the non-transitory memory, wherein the instructions, when executed by the at least one processor, cause the device to:
detect at least two pieces of duration information of a first serving cell, wherein each piece of duration information of the at least two pieces of duration information respectively comprises information about a length of a last subframe on a time resource, and wherein the time resource is comprised in a time period in which the first serving cell occupies an unlicensed spectrum; and
determine an ending moment of the time resource according to a last piece of detected duration information of the at least two pieces of duration information.
2. The device according to claim 1 , wherein:
the at least two pieces of duration information are carried on a physical layer common control channel.
3. A device, comprising:
a non-transitory memory storing program instructions; and
at least one processor coupled to the non-transitory memory, wherein the instructions, when executed by the at least one processor, cause the device to:
determine an ending moment of a time resource, wherein the time resource is comprised in a time period in which a first serving cell occupies an unlicensed spectrum; and
send at least two pieces of duration information to a terminal device, wherein each piece of duration information of the at least two pieces of duration information respectively comprises information about a length of a last subframe on the time resource.
4. The device according to claim 3 , wherein:
the at least two pieces of duration information are carried on a physical layer common control channel.
5. A data transmission method, comprising:
detecting, by a device, at least two pieces of duration information of a first serving cell, wherein each piece of duration information of the at least two pieces of duration information respectively comprises information about a length of a last subframe on a time resource, and wherein the time resource is comprised in a time period in which the first serving cell occupies an unlicensed spectrum; and
determining, by the device, an ending moment of the time resource according to a last piece of duration information of the at least two pieces of duration information.
6. The method according to claim 5 , wherein:
the at least two pieces of duration information are carried on a physical layer common control channel.
7. A data transmission method, comprising:
determining, by a device, an ending moment of a time resource, wherein the time resource is comprised in a time period in which a first serving cell occupies an unlicensed spectrum; and
sending, by the device, at least two pieces of duration information to a terminal device, wherein each piece of duration information of the at least two pieces of duration information respectively comprises information about a length of a last subframe on the time resource.
8. The method according to claim 7 , wherein:
the at least two pieces of duration information are carried on a physical layer common control channel.