ucture of the 3GPP LTE physical resource block [107] CHAPTER 9 The IEEE 802. 16m Physical Layer (Part I) resource block size is the same for all bandwidths. The resource blocks are allocated in pairs in the time-domain by the scheduler. In the uplink, the transmitted signal in each slot is described by a resource grid of RB SC subcarriers and N UL SC-FDMA symbols. The resource grid is illustrated in Figure 9-67. The number of resource blocks NUT depends on the uplink transmission bandwidth configured in the cell and bounded as N RB RB Nmin,UL RB 6 and max,UL RB = 110 are the minimum and maximum number of resource blocks in the uplink which depend on the transmission bandwidth (see Figure 9-65). A physical resource block in the uplink thus consists of UL symb VRB SC resource elements, corresponding to one slot in the time domain and 180 kHz in the frequency domain. In the downlink, similarly, the transmitted signal in each slot is described by a resource grid of SC sub-carriers and NDL OFDM symbols. The resource grid structure is illustrated in Figure 9-67. The quantity depends on the downlink transmission bandwidth configured in the cell and satisfies min,DL RB N max,DL RB , where min,DL RB = 6 and max,DL = 110 are the lower and upper bounds, respectively. The set of allowed values for NDL RB is given in reference [107]. The number OFDM symbols in a slot depends on the cyclic prefix length and the sub-carrier spacing. A physical resource block is defined as NDL symb consecutive OFDM symbols in the time-domain and NRB consecutive sub-carriers in the frequency-domain, where NSVL symb and NRB SC are the number of symbols per slot and the number of sub-carriers per physical resource block, respectively. A physical resource block thus consists of N DL symb JRB SC resource elements, corresponding to one slot in the time- domain and 180 kHz in the frequency-domain. Physical resource blocks are numbered from 0 to NDL - 1 in the frequency-domain For multi-antenna transmission, there is one resource grid defined per antenn