P layer of the destination (base station in the uplink or user terminal in the downlink). User-Plane packet delay includes delay introduced by associated protocols and signaling, assuming the user terminal is in the active mode. The IMT-Advanced systems are required to achieve a transport Table 1-2 Comparison of the Requirements of Prominent Mobile Broadband Wireless Systems Requirements IMT-Advanced [15] IEEE 802.16m [21] 3GPP LTE-Advanced [20] Peak spectrum efficiency (bit/ DL: 15 (4 X 4) DL: 8.0/15.0 (2 X 2/4 X 4) DL: 30 (8 X 8) sec/Hz) (system-level) UL: 6.75 (2 X 4) UL: 2.8/6.75 (1 X 2/2 X 4) UL: 15 (4 X 4) Cell spectral efficiency (bit/sec/ DL: (4 X 2) = 2.2 DL: (2 X 2) = 2.6 DL: (4 X 2) = 2.6 Hz/sector) (system-level) UL: (2 X 4) = 1.4 (Base UL: (1 X 2) = 1.3 (Mixed UL: (2 X 4) = 2.0 coverage urban) mobility) Cell-edge user spectral DL: (4 X 2) = 0.06 DL: (2 X 2) = 0.09 DL: (4 X 2) = 0.09 efficiency (bit/sec/Hz) UL: (2 X 4) = 0.03 (Base UL: (1 X 2) = 0.05 UL: (2 X 4) = 0.07 (Base coverage (system-level) coverage urban) (Mixed mobility) urban) Latency C-plane: 100 msec (idle to C-plane: 100 msec (idle to C-plane: 50 msec (idle/camped state to active) active) connected) U-plane: 10 msec U-plane: 10 msec 10 msec (dormant state to active state) U-plane: 10 msec Mobility bit/sec/Hz at km/h 55 at 120 km/h Optimal performance up to Optimal performance up to 10 km/h (link-level) 25 at 350 km/h 10 km/h Up to 500 km/h depending on operating Graceful: degradation up to frequency 120 km/h Connectivity up to 350 km/h Up to 500 km/h depending on operating frequency Handover interruption time Intra frequency: 27.5 Intra frequency: 27.5 Not specified (msec) Inter frequency: 40 (in Inter frequency: 40 (in a band) a band) 60 (between bands) 60 (between bands) VolP capacity (Active users/ 40 (4 X 2 and 2 X 4) (Base 60 (DL: 2 X 2 and UL: 1 X 2) VolP capacity should be improved sector/MHz) (system-level) coverage urban) relative to that of E-UTRA for all antenna configurations Antenna configuration Not specified DL: 2 X 2 (bas