Section: 6.10.5 CSI reference signals
Content: CSI reference signals are transmitted on 1, 2, 4, 8, 12, 16, 20, 24, 28, or 32 antenna ports using , , , , , ,, , and, respectively. For CSI reference signals using more than eight antenna ports, CSI-RS configurations in the same subframe, numbered from 0 to , where value 0 corresponds to the configured resourceConfig-r11 or resourceConfig-r10 and value k (k>0) corresponds to the configured k-th entry of NZP-ResourceConfig-r13 from an aggregated list consisting of nzp-resourceConfigList-r13 followed by nzp-resourceConfigListExt-r14 (if configured), are aggregated to obtain antenna ports in total. Each CSI-RS configuration in such an aggregation corresponds to antenna ports and one of the configurations in the range 0-19 in Table 6.10.5.2-1 for normal cyclic prefix, and one of the configurations in the range 0-15 in Table 6.10.5.2-2 for extended cyclic prefix. The supported configurations of aggregated CSI-RS configurations are shown in Table 6.10.5-1. If the higher layer parameter NZP-TransmissionComb is not configured, unique CSI-RS configurations from Table 6.10.5.2-1 for normal cyclic prefix and from Table 6.10.5.2-2 for extended cyclic prefix are aggregated to form 12, 16, 20, 24, 28, or 32 antenna ports. For CSI reference signals using more than sixteen antenna ports, when higher layer parameter NZP-TransmissionComb is configured, the number of unique CSI-RS configurations from Table 6.10.5.2-1 for normal cyclic prefix and from Table 6.10.5.2-2 for extended cyclic prefix that are aggregated to form 20, 24, 28, or 32 antenna ports can be less than or equal to . The number of antenna ports within each such unique CSI-RS resource configuration is an integer multiple of . CSI reference signals are defined for only. Table 6.10.5-1: Aggregation of CSI-RS configurations.