Two consecutive time slots, each of 0.5 ms duration. A subframe represents the LTE scheduling time, which means that at each millisecond the eNode-B decides as to which users are to be scheduled and which resource blocks are assigned to which user. The number of parallel resource blocks in each subframe depends on the system bandwidth. If a 10-MHz carrier is used, 600 subcarriers are available (see Table 4.3). As a resource block bundles 12 subcarriers, a total of 50 resource blocks can be scheduled for one or more users per subframe.