Section: 5.6A Channel bandwidth for CA
Content: For intra-band contiguous carrier aggregation Aggregated Channel Bandwidth, Aggregated Transmission Bandwidth Configuration and Guard Bands are defined as follows, see Figure -1. Figure 5.6A-1. Definition of Aggregated channel bandwidth and aggregated channel bandwidth edges The aggregated channel bandwidth, BWChannel_CA, is defined as BWChannel_CA = Fedge,high - Fedge,low [MHz]. The lower bandwidth edge Fedge,low and the upper bandwidth edge Fedge,high of the aggregated channel bandwidth are used as frequency reference points for transmitter and receiver requirements and are defined by Fedge,low = FC,low - Foffset,low Fedge,high = FC,high + Foffset,high The lower and upper frequency offsets depend on the transmission bandwidth configurations of the lowest and highest assigned edge component carrier and are defined as Foffset,low = (0.18NRB,low + f1)/2 + BWGB [MHz] Foffset,high = (0.18NRB,high + f1)/2 + BWGB [MHz] where f1 = f for the downlink with f the subcarrier spacing and f1 = 0 for the uplink, while NRB,low and NRB,high are the transmission bandwidth configurations according to Table 5.6-1 for the lowest and highest assigned component carrier, respectively. BWGB denotes the Nominal Guard Band and is defined in Table 5.6A-1, and the factor 0.18 is the PRB bandwidth in MHz. NOTE: The values of BWChannel_CA for UE and BS are the same if the lowest and the highest component carriers are identical. Aggregated Transmission Bandwidth Configuration is the number of the aggregated RBs within the fully allocated Aggregated Channel bandwidth and is defined per CA Bandwidth Class (Table 5.6A-1). For intra-band non-contiguous carrier aggregation Sub-block Bandwidth and Sub-block edges are defined as follows, see Figure -2. Figure -2. Non-contiguous intraband CA terms and definitions The lower sub-block edge of the Sub-block Bandwidth (BWChannel,block) is defined as Fedge,block, low = FC,block,low - Foffset,block, low. The upper sub-block edge of the Sub-block Bandwidth is defined as Fedge,block,high = FC,block,high + Foffset,block,high . The Sub-block Bandwidth, BWChannel,block, is defined as follows: BWChannel,block = Fedge,block,high - Fedge,block,low [MHz] The lower and upper frequency offsets Foffset,block,low and Foffset,block,high depend on the transmission bandwidth configurations of the lowest and highest assigned edge component carriers within a sub-block and are defined as Foffset,block,low = (0.18NRB,low + f1) /2 + BWGB [MHz] Foffset,block,high = (0.18NRB,high + f1)/2 + BWGB [MHz] where f1 = f for the downlink with f the subcarrier spacing and f1 = 0 for the uplink, while NRB,low and NRB,high are the transmission bandwidth configurations according to Table 5.6-1 for the lowest and highest assigned component carrier within a sub-block, respectively. BWGB denotes the Nominal Guard Band and is defined in Table 5.6A-1, and the factor 0.18 is the PRB bandwidth in MHz. The sub-block gap size between two consecutive sub-blocks Wgap is defined as Wgap = Fedge,block n+1,low - Fedge,block n,high [MHz] Table 5.6A-1: CA bandwidth classes and corresponding nominal guard bands The channel spacing between centre frequencies of contiguously aggregated component carriers is defined in subclause 5.7.1A.