systems and the base station equipment itself. Active sharing is more doable during Greenfield deployments whereas passive sharing is feasible in both Greenfield deployments and in existing commercial networks. Table 13.2 IMT-advanced RIT attributes Requirements Environment ITU-R Target 3GPP Target IEEE Target Peak Data Rates High Speed/Rural 100 Mbps 100 Mbps 100 Mbps Low Speed 1.0 Gbps 1.0 Gbps 1.0 Gbps 1 Gbps (DL), 500 Mbps Peak Cell Spectral 15 (DL), 6.75 (UL) 30 (DL), 15 (UL) 8/15 (DL), 2.8/6.75 (UL) [Antenna Efficiency (bps/Hz/cell) [Antenna Configuration: [Antenna Configuration: Configuration: 2x2/4x4 (DL) and 4x4 (DL) and 2x4 (UL)] 8x8 (DL) and 4x4 (UL)] 1 x2/2x4 (UL)] Average Cell Spectral Case 1 2.4, 2.6, and 3.7 (DL); 1.2 Efficiency (bps/Hz/cell) and 2.0 (UL) Indoor 3.0 (DL), 2.25 (UL) Microcellular 2.6 (DL), 1.8 (UL) Base coverage urban 2.2 (DL), 1.4 (UL) DL (2x2) = 2.6, UL (1x2) = 1.3 High Speed/Rural 1.1 (DL), 0.7 (UL) Cell edge user Spectral Case 1 0.07, 0.09, and 0.12 (DL); Efficiency (bps/Hz/cell) 0.04 and 0.12 (UL) Indoor 0.1 (DL), 0.07 (UL) Microcellular 0.075 (DL), 0.05 (UL) Base coverage urban 0.06 (DL), 0.03 (UL) DL (2x2) = 0.09, UL (1x2) = 0.05 High Speed/Rural 0.04 (DL), 0.015 (UL) Not defined yet Scalable Bandwidth up to 40 MHz Not defined yet 100 ms Latency (control plane) 100 ms 50 ms 10 ms Latency (user plane) 10 ms Not defined yet Optimal performance up to 10 km/h (Continued) Table 13.2 (Continued) Requirements Environment ITU-R Target 3GPP Target IEEE Target Mobility 10 km/h 1.0 bps/Hz Not defined yet (support up to 500 km/h) 30 km/h 0.75 bps/Hz Graceful degradation' up to 120 km/h 120 km/h 0.55 bps/Hz "Connectivity" up to 350 km/h 350 km/h 0.25 bps/Hz Up to 500 km/h depending on operating frequency Handover Interruption Intra frequency 27.5 ms Not defined yet 27.5 ms Inter frequency (within a spectrum band) 40 ms 40 ms Inter frequency (between spectrum band) 60 ms 60 ms VoIP Capacity (Active Indoor Not defined yet 60 (DL 2x2 and UL 1 x2) users/sector/MHz) Microcellular Base coverage