Method for performing communication by using unlicensed spectrum, device, and system
Embodiments of the present invention disclose a method for performing communication by using an unlicensed spectrum, a device, and a system, which relate to the field of communications technologies, so as to improve efficiency of using an unlicensed spectrum by user equipment. The method includes: obtaining, by a base station eNB, a time resource and/or a frequency resource by contending with another eNB or another system using an unlicensed spectrum; generating, by the base station eNB, information about the time resource and/or the frequency resource according to the time resource and/or the frequency resource; and sending, by the base station eNB, the information about the time resource and/or the frequency resource to user equipment UE by using a broadcast or multicast message, so that the user equipment UE communicates with the base station eNB according to the information about the time resource and/or the frequency resource.
1. User equipment in communication with a base station (eNB), comprising:
a memory;
a data bus connected to the memory;
at least one communications interface separately connected to the memory; and
a processor, separately connected to the at least one communications interface, configured to:
receive, by using the at least one communications interface, information about a time resource and/or a frequency resource obtained by contention by the base station (eNB) in an unlicensed spectrum and is sent by the base station,
determine configuration information according to the information about the time resource and/or the frequency resource, by
determining a length of a discontinuous reception (DRX) activation time according to a preset DRX parameter and the received information about the time resource and/or the frequency resource; and/or
determining, according to the preset DRX parameter and the received information about the time resource and/or the frequency resource, an operation for a timer corresponding to DRX, and
communicate with the base station eNB via the at least one communications interface, according to the configuration information determined according to the information about the time resource and/or the frequency resource,
wherein the processor is further configured to obtain an actual length of an activation time by comparing a required DRX activation time with a time length of the time resource and/or the frequency resource.
2. The user equipment according to claim 1 , wherein the processor is further configured to: when an end time of the time resource and/or the frequency resource in the received information about the time resource and/or the frequency resource arrives, or the DRX activation time determined according to the preset discontinuous reception DRX parameter and the received information about the time resource and/or the frequency resource expires, stop or suspend at least one timer corresponding to the DRX, wherein the timer corresponding to the DRX comprises at least one of the following timers: an on-duration timer, a DRX activation time timer, a DRX retransmission timer, a DRX short cycle timer, or a DRX long cycle timer.
3. The user equipment according to claim 1 , wherein the processor is further configured to: when the UE receives information that is about a new time resource and/or a new frequency resource obtained by contention and that is notified by the eNB, start or restart at least one of the following stopped or suspended DRX-related timers: the on-duration timer, the DRX activation time timer, the DRX retransmission timer, the DRX short cycle timer, or the DRX long cycle timer at a start time location of the new time resource and/or the new frequency resource obtained by contention, or within a preset time, or at a start location of the DRX activation time determined according to the preset discontinuous reception DRX parameter and the received information about the time resource and/or the frequency resource.
4. The user equipment according to claim 1 , wherein a start location of transmit timing of the PSS and/or the SSS starts from a start location of the time resource and/or the frequency resource obtained by contention.
5. The user equipment according to claim 4 , wherein the processor is further configured to:
use the start location of the time resource and/or the frequency resource obtained by contention as a frame 0 and/or a subframe 0; or
count, by following the last frame number and/or the last subframe number on a resource obtained by contention previous time, a frame number and a subframe number of the start location of the time resource and/or the frequency resource obtained by contention.
6. The user equipment according to claim 1 , wherein the information about a time resource and/or a frequency resource includes at least one Unlicensed-Radio Network Temporary Identity (U-RNTI), and the U-RNTI is used to detect for detecting a physical downlink control channel (PDCCH).
7. A method for performing communication by using an unlicensed spectrum, comprising:
receiving, by user equipment (UE), information that is about a time resource and/or a frequency resource obtained by contention by a base station in an unlicensed spectrum and that is sent by the base station; and
communicating, by the UE, with the base station according to the information about the time resource and/or the frequency resource, after determining, by the UE, configuration information according to the information about the time resource and/or the frequency resource, by
calculating a valid time of the time resource and/or the frequency resource according to a start moment of received physical downlink control channel (PDCCH) scheduling signaling, or calculating a valid time of the time resource and/or the frequency resource according to a preset time; and/or
detecting a primary synchronization signal (PSS) and/or a secondary synchronization signal (SSS) on the obtained time resource and/or frequency resource according to the time resource and/or the frequency resource; and/or
determining a length of a discontinuous reception (DRX) activation time according to a preset DRX parameter and the received information about the time resource and/or the frequency resource; and/or
determining, according to the preset DRX parameter and the received information about the time resource and/or the frequency resource, an operation for a timer corresponding to DRX,
wherein an actual length of an activation time is obtained by comparing a required DRX activation time with a time length of the time resource and/or the frequency resource.
8. The method according to claim 7 , wherein the determining, according to the preset DRX parameter and the received information about the time resource and/or the frequency resource, an operation for a timer corresponding to DRX comprises:
when an end time of the time resource and/or the frequency resource in the received information about the time resource and/or the frequency resource arrives, or the DRX activation time determined according to the preset discontinuous reception DRX parameter and the received information about the time resource and/or the frequency resource expires, stopping or suspending, by the UE, at least one timer corresponding to the DRX, wherein the timer corresponding to the DRX comprises at least one of the following timers: an on-duration timer, a DRX activation time timer, a DRX retransmission timer, a DRX short cycle timer, or a DRX long cycle timer.
9. The method according to claim 7 , wherein the information about a time resource and/or a frequency resource includes at least one Unlicensed-Radio Network Temporary Identity (U-RNTI), and the U-RNTI is used to detect for detecting a physical downlink control channel (PDCCH).