Spectrum efficiency is defined as the number of bits transferred per second per hertz (bits/s/Hz). For LTE, Spectrum efficiency targets were formulated relative to comparison with Release 6 of (WCDMA) HSPA baseline system.
For Uplink
LTE Uplink can achieve 2-3 times improved spectrum efficiency as that of Release 6 HSPA (WCDMA)
For Downlink.
It can achieve 3-4 times better spectrum efficiency than HSDPA (WCDMA)