Method and apparatus for managing allocation and usage of radio resource, method and apparatus for transmitting data through unlicensed band channel, and method and apparatus for managing access of radio resource

Abstract

Provided is a method for transmitting, by a transmitter, a first data having periodicity through a channel of an unlicensed band: The transmitter adjusts at least one of transmission timing of the first data and clear channel assessment (CCA) timing for the channel to occupy the channel. The transmitter determines whether the channel may be occupied by performing a CCA on the channel at the CCA timing. The transmitter transmits the first data through the channel at the transmission timing of the first data, when it is determined that the channel may be occupied.

What is claimed is: 
     
         1 . A method for transmitting, by a transmitter, a first data having periodicity through a channel of an unlicensed band, comprising:
 adjusting at least one of transmission timing of the first data and clear channel assessment (CCA) timing for the channel to occupy the channel;   determining whether the channel is occupied by performing a CCA on the channel at the CCA timing; and   when it is determined that the channel is occupied, transmitting the first data through the channel at the transmission timing of the first data.   
     
     
         2 . The method of  claim 1 , wherein:
 the adjusting includes:   adjusting a transmission offset for the transmission timing of the first data so that the transmission timing of the first data does not overlap with timing when other apparatuses transmit data having the periodicity through the channel.   
     
     
         3 . The method of  claim 1 , wherein:
 the determining includes:   continuously performing the CCA on the channel until the channel is occupied, independent of a transmission offset for the transmission timing of the first data.   
     
     
         4 . The method of  claim 3 , wherein:
 the transmitting includes:   transmitting the first data at the timing when the channel is occupied, not timing when the first data is scheduled to be transmitted; and   informing a receiver receiving the first data that the first data is transmitted at timing other than the scheduled timing.   
     
     
         5 . The method of  claim 1 , wherein:
 the adjusting includes:   when the first data is not transmitted within a previous transmission period for the first data, configuring the CCA timing to be timing earlier than timing when the CCA starts within the previous transmission period by a predetermined value.   
     
     
         6 . The method of  claim 5 , wherein:
 the configuring of the CCA timing includes:   when a sum of a first duration between the transmission timing of the first data defined by a transmission offset for the first data and timing when the CCA ends and a second duration for the transmission of the first data exceeds a limited occupation time for the channel, configuring the CCA timing to be the timing when the CCA starts within the previous transmission period.   
     
     
         7 . The method of  claim 5 , wherein:
 the transmitting includes:   when the channel is occupied, transmitting a special signal through the channel to prevent other apparatuses from occupying the channel, from timing when the CCA ends to the transmission timing of the first data.   
     
     
         8 . The method of  claim 7 , further comprising:
 when the first data is successfully transmitted through the channel, configuring CCA timing for a subsequent transmission period so that the CCA ends before the transmission timing of the first data defined by a transmission offset of the first data within the subsequent transmission period for the first data.   
     
     
         9 . The method of  claim 1 , wherein:
 the transmitter is a base station, and   the first data is a discovery signal (DRS).   
     
     
         10 . The method of  claim 1 , wherein:
 the transmitter is a terminal, and   the first data is an uplink signal transmitted to a base station.   
     
     
         11 . A method for transmitting, by a transmitter, a first data having periodicity and a second data having aperiodicity through a channel of an unlicensed band, comprising:
 adjusting at least one of first clear channel assessment (CCA) for transmission of the first data, second CCA for transmission of the second data, and the transmission of the second data, in consideration of a limited occupation time for the channel; and   when the channel is occupied through at least one of the first CCA and the second CCA, transmitting the first data through the channel at first timing defined by a transmission offset of the first data.   
     
     
         12 . The method of  claim 11 , further comprising:
 prior to the adjusting,   transmitting the second data through the channel when the channel is occupied through the second CCA,   wherein the adjusting includes:   early ending the transmission of the second data to secure a duration in which the first CCA is performed.   
     
     
         13 . The method of  claim 11 , wherein:
 the adjusting includes:   omitting the first CCA when the channel is occupied through the second CCA, and   the transmitting includes:   transmitting the first data and the second data through the channel occupied through the second CCA.   
     
     
         14 . The method of  claim 11 , wherein:
 the adjusting includes:   omitting the second CCA when the channel is occupied through the first CCA, and   the transmitting includes:   transmitting the first data and then transmitting the second data, through the channel occupied through the first CCA.   
     
     
         15 . The method of  claim 11 , wherein:
 the adjusting includes:   when a time interval between timing when the second data is transmitted and the first timing is equal to or less than a predetermined value, delaying timing of the second CCA to after the timing when the first data is transmitted.   
     
     
         16 . A method for transmitting, by a transmitter, a first data having periodicity and a second data having aperiodicity through a channel of an unlicensed band, comprising:
 adjusting at least one of a first duration in which a clear channel assessment (CCA) for transmission of the first data is performed, a second duration in which a CCA for transmission of the second data is performed, and a transmission period length of the first data to increase channel occupation possibility for the transmission of the first data;   performing the CCA during the first duration; and   transmitting the first data through the channel when the channel is occupied through the CCA.   
     
     
         17 . The method of  claim 16 , wherein:
 the adjusting includes:   reducing at least one of the number of CCA unit times for the first duration and a length of the CCA unit time; and   determining the first duration by multiplying the number of CCA unit times by the length of the CCA unit time.   
     
     
         18 . The method of  claim 16 , wherein:
 the adjusting includes:   configuring a first range as a range of values included in the number of CCA unit times for the first duration to be smaller than a second range as a range of values included in the number of CCA unit times for the second duration; and   determining the first duration by multiplying the number of CCA unit times selected within the first range by a length of the CCA unit time for the first duration.   
     
     
         19 . The method of  claim 16 , wherein:
 the adjusting includes:   reducing or maintaining a first range as a range of values included in the number of CCA unit times for the first duration and increasing s second range as a range of values included in the number of CCA unit times for the second duration, when the first data is not transmitted within a previous transmission period for the first data;   selecting the number of CCA unit times for the first duration within the first range; and   determining the first duration by multiplying the selected number of CCA unit times by a length of the CCA unit time for the first duration.   
     
     
         20 . The method of  claim 16 , wherein:
 the adjusting includes:   reducing the transmission period length of the first data, when the first data is not transmitted within a previous transmission period for the first data.