Method for selecting carrier and communication device

Abstract

A carrier selection method and a communications device includes obtaining channel busy ratios (CBR) of a plurality of candidate carriers. The method also includes performing filtering processing on the CBRs of the plurality of candidate carriers to obtain CBRs of the plurality of candidate carriers after filtering. The method also includes selecting a carrier from the plurality of candidate carriers according to the CBRs of the plurality of candidate carriers that are obtained after filtering. Therefore, filtering processing is performed on a measurement result of the CBRs of the plurality of candidate carriers, and the carrier is selected from the plurality of candidate carriers according to the CBRs of the plurality of candidate carriers that are obtained after filtering processing, thereby reducing carrier switching frequency and ensuring system stability while the carrier is selected.

1 . A carrier selection method, wherein the method comprises:
 obtaining channel busy ratios (CBR) of a plurality of candidate carriers;   determining whether a CBR of a first carrier exceeds a third threshold, wherein the first carrier is a carrier used in current data transmission; and   if the CBR of the first carrier exceeds the third threshold, selecting a carrier from the plurality of carriers according to the CBRs of the plurality of carriers.   
     
     
         2 . The method according to  claim 1 , wherein the plurality of carriers comprise the first carrier. 
     
     
         3 . The method according to  claim 1 , wherein the selecting a carrier from the plurality of carriers comprises:
 selecting a carrier having a smallest CBR as the to-be-used carrier from the plurality of carriers according to the CBRs of the plurality of carriers.   
     
     
         4 . The method according to  claim 1 , wherein the method is performed by a terminal device, and the obtaining CBRs of the plurality of candidate carriers comprises:
 measuring, by the terminal device, the CBRs of the plurality of carriers, to obtain the CBRs of the plurality of carriers.   
     
     
         5 . The method according to  claim 1 , wherein the method further comprises:
 obtaining, by a terminal device, the third threshold preconfigured in the terminal device; or   receiving, by the terminal device, configuration information sent by the network device, wherein the configuration information comprises the third threshold.   
     
     
         6 . The method according to  claim 1 , wherein a CBR of each of the plurality of carriers is a CBR of a resource pool used by the terminal device on the carrier. 
     
     
         7 . The method according to  claim 6 , wherein the resource pool used by the terminal device on the carrier is a resource pool that corresponds to a zone of the terminal and that is in a plurality of resource pools, and there are correspondences between the plurality of resource pools and a plurality of zones. 
     
     
         8 . A communication device, comprising:
 a processor;   a memory having stored thereon an instruction,   wherein the processor is configured to invoke the instruction stored in the memory to perform:   obtaining channel busy ratios (CBR) of a plurality of candidate carriers;   determining whether a CBR of a first carrier exceeds a third threshold, wherein the first carrier is a carrier used in current data transmission; and   if the CBR of the first carrier exceeds the third threshold, selecting a carrier from the plurality of carriers according to the CBRs of the plurality of carriers.   
     
     
         9 . The communication device according to  claim 8 , wherein the plurality of carriers comprise the first carrier. 
     
     
         10 . The communication device according to  claim 8 , wherein the processor is configured to invoke the instruction stored in the memory to perform:
 selecting a carrier having a smallest CBR as the to-be-used carrier from the plurality of carriers according to the CBRs of the plurality of carriers.   
     
     
         11 . The communication device according to  claim 8 , wherein the communication device is a terminal device, and the processor is configured to invoke the instruction stored in the memory to perform:
 measuring, by the terminal device, the CBRs of the plurality of carriers, to obtain the CBRs of the plurality of carriers.   
     
     
         12 . The communication device according to  claim 8 , wherein the processor is configured to invoke the instruction stored in the memory to perform:
 obtaining, by a terminal device, the third threshold preconfigured in the terminal device; or   receiving, by the terminal device, configuration information sent by the network device, wherein the configuration information comprises the third threshold.   
     
     
         13 . The communication device according to  claim 1 , wherein a CBR of each of the plurality of carriers is a CBR of a resource pool used by a terminal device on the carrier. 
     
     
         14 . The communication device according to  claim 13 , wherein the resource pool used by the terminal device on the carrier is a resource pool that corresponds to a zone of the terminal and that is in a plurality of resource pools, and there are correspondences between the plurality of resource pools and a plurality of zones. 
     
     
         15 . A chip comprising a processor which is configured to invoke and run a computer program from a memory, to enable a device having the chip installed therein to perform the method according to  claim 1 .