A method implemented by a wireless transmit/receive unit, WTRU, the method comprising: determining a configured first set of cells associated with a first eNodeB, eNB, and a configured second set of cells associated with a second eNB, wherein the WTRU has a first power headroom report, PHR, prohibit timer for the configured first set of cells associated with the first eNB and a second PHR prohibit timer for the configured second set of cells associated with the second eNB, and wherein the WTRU has a first trigger condition for the configured first set of cells associated with the first eNB and a second trigger condition for the configured second set of cells associated with the second eNB; determining whether the first trigger condition for the configured first set of cells associated with the first eNB is met; sending, to the first eNB, a first PHR comprising power headrooms associated with the configured first set of cells and the configured second set of cells on a condition that the first trigger condition for the configured first set of cells associated with the first eNB is met; resetting the first PHR prohibit timer when sending the first PHR; determining whether the second trigger condition for the configured second set of cells associated with the second eNB is met, wherein the second trigger condition is associated with the configured second set of cells and is independent of the first trigger condition for the configured first set of cells; sending, to the second eNB, a second PHR comprising power headrooms associated with the configured first set of cells and the configured second set of cells on a condition that the second trigger condition for the configured second set of cells associated with the second eNB is met; and resetting the second PHR prohibit timer when sending the second PHR determining a configured first set of cells associated with a first eNodeB, eNB, and a configured second set of cells associated with a second eNB, wherein the WTRU has a first power headroom report, PHR, prohibit timer for the configured first set of cells associated with the first eNB and a second PHR prohibit timer for the configured second set of cells associated with the second eNB, and wherein the WTRU has a first trigger condition for the configured first set of cells associated with the first eNB and a second trigger condition for the configured second set of cells associated with the second eNB; determining whether the first trigger condition for the configured first set of cells associated with the first eNB is met; sending, to the first eNB, a first PHR comprising power headrooms associated with the configured first set of cells and the configured second set of cells on a condition that the first trigger condition for the configured first set of cells associated with the first eNB is met; resetting the first PHR prohibit timer when sending the first PHR; determining whether the second trigger condition for the configured second set of cells associated with the second eNB is met, wherein the second trigger condition is associated with the configured second set of cells and is independent of the first trigger condition for the configured first set of cells; sending, to the second eNB, a second PHR comprising power headrooms associated with the configured first set of cells and the configured second set of cells on a condition that the second trigger condition for the configured second set of cells associated with the second eNB is met; and resetting the second PHR prohibit timer when sending the second PHR