An evolved NodeB, eNB comprising: a processor; and a memory in electronic communication with the processor, wherein the processor is configured by instructions stored in the memory to: obtain a channel status at one of multiple Licensed-Assisted Access, LAA, cells by performing clear channel assessment, CCA, detection; manage a counter which is dedicatedly used to determine timing of transmission on the one of multiple LAA cells; determine whether the channel status is idle or busy, the channel status being obtained by the CCA detection performed for extended CCA, ECCA, ECCA slot duration; and perform a procedure during which the eNB is configured to reduce the counter until the counter reaches zero, wherein the procedure is a procedure during which, the eNB is configured to, for each ECCA slot duration, determine its action from a first action, a second action, and a third action, based on the channel status obtained for the ECCA slot duration, the first action being to decrement the counter when the eNB determines that, as the channel status is idle, the eNB decrements the counter, the second action being to suspend the counter when the eNB determines that, although the channel status is idle, the eNB suspends the counter, the third action being to suspend the counter when the eNB determines that, as the channel status is busy, the eNB suspends the counter; and perform the transmission, after the counter reaches zero. a processor; and a memory in electronic communication with the processor, wherein the processor is configured by instructions stored in the memory to: obtain a channel status at one of multiple Licensed-Assisted Access, LAA, cells by performing clear channel assessment, CCA, detection; manage a counter which is dedicatedly used to determine timing of transmission on the one of multiple LAA cells; determine whether the channel status is idle or busy, the channel status being obtained by the CCA detection performed for extended CCA, ECCA, ECCA slot duration; and perform a procedure during which the eNB is configured to reduce the counter until the counter reaches zero, wherein the procedure is a procedure during which, the eNB is configured to, for each ECCA slot duration, determine its action from a first action, a second action, and a third action, based on the channel status obtained for the ECCA slot duration, the first action being to decrement the counter when the eNB determines that, as the channel status is idle, the eNB decrements the counter, the second action being to suspend the counter when the eNB determines that, although the channel status is idle, the eNB suspends the counter, the third action being to suspend the counter when the eNB determines that, as the channel status is busy, the eNB suspends the counter; and perform the transmission, after the counter reaches zero. obtain a channel status at one of multiple Licensed-Assisted Access, LAA, cells by performing clear channel assessment, CCA, detection; manage a counter which is dedicatedly used to determine timing of transmission on the one of multiple LAA cells; determine whether the channel status is idle or busy, the channel status being obtained by the CCA detection performed for extended CCA, ECCA, ECCA slot duration; and perform a procedure during which the eNB is configured to reduce the counter until the counter reaches zero, wherein the procedure is a procedure during which, the eNB is configured to, for each ECCA slot duration, determine its action from a first action, a second action, and a third action, based on the channel status obtained for the ECCA slot duration, the first action being to decrement the counter when the eNB determines that, as the channel status is idle, the eNB decrements the counter, the second action being to suspend the counter when the eNB determines that, although the channel status is idle, the eNB suspends the counter, the third action being to suspend the counter when the eNB determines that, as the channel status is busy, the eNB suspends the counter; and the procedure is a procedure during which, the eNB is configured to, for each ECCA slot duration, determine its action from a first action, a second action, and a third action, based on the channel status obtained for the ECCA slot duration, the first action being to decrement the counter when the eNB determines that, as the channel status is idle, the eNB decrements the counter, the second action being to suspend the counter when the eNB determines that, although the channel status is idle, the eNB suspends the counter, the third action being to suspend the counter when the eNB determines that, as the channel status is busy, the eNB suspends the counter; and perform the transmission, after the counter reaches zero.