4 (C) 0.7/0.015 0.080 Rel-8 MU-MIMO 1 X 4 (A) 0.7/0.015 0.093 CoMP 2 X 4 (A) 0.7/0.015 MU-MIMO 1 X 8 (E) 0.7/0.015 12.10 3GPP LTE-advanced link-level and system-level performance -0.5% -0.5% Antenna Configuration (A) Antenna Configuration (B) 0.52 - -0.52 Antenna Configuration (C) Antenna Configuration (D) Antenna Configuration (E) FIGURE 12-19 An illustration of antenna configurations that are used in 3GPP evaluations wavelength separation between antennas within each group; (3) correlated and co-polarized, i.e., there is a 0.5-wavelength distance between antennas; (4) uncorrelated and cross-polarized, i.e., columns with 45 linearly polarized antennas and separated by 4 wavelengths; and (5) correlated and cross- polarized, i.e., columns with 45 linearly polarized antennas separated by 0.5 wavelengths. These configurations are illustrated in Figure 12-19. The downlink and uplink cell and cell edge spectral efficiencies in various test environments for the TDD and FDD duplex schemes are shown in Tables 12-18 and 12-19, respectively. In these tables, the acronyms "JP-CoMP," "CS-CoMP," and "CB-CoMP" refer to joint processing, coordinated sched- uling, and coordinated beamforming multi-point transmission schemes, respectively. The joint pro- cessing refers to a CoMP scheme where data is available at each of the geographically separated points and PDSCH transmission occurs from multiple points, whereas coordinated scheduling/beamforming is an alternative CoMP technique where data is only available at the serving cell and data transmission is from that point, but user scheduling/beamforming decisions are made by coordination between different cells. 12.10.2 VolP Capacity The number of active VoIP users was calculated through extensive system-level simulations that were conducted by a number of 3GPP member companies. Table 12-20 shows the VoIP capacity results in the indoor, micro-cellular, macro-cellular, and high speed test environments for the FDD and TDD duplex schemes. The results suggest that the 3GPP LTE Rel-8 ca