Technical Description
The standard's proposed benefits:
- IP roaming & handoff (at more than 1 Mbit/s)
- New MAC and PHY with IP and adaptive antennas
- Optimized for full mobility up to vehicular speeds of 250 km/h
- Operates in Licensed Bands (below 3.5 GHz)
- Utilizes Packet Architecture
- Low Latency
Some technical details were:
- Bandwidths of 5, 10, and 20 MHz.
- Peak data rates of 80 Mbit/s.
- Spectral efficiency above 1 bit/sec/Hz using multiple input/multiple output technology (MIMO).
- Layered frequency hopping allocates OFDM carriers to near, middle, and far-away handsets, improving SNR (works best for SISO handsets.)
- Supports low-bit rates efficiently, carrying up to 100 phone calls per MHz.
- Hybrid ARQ with up to 6 transmissions and several choices for interleaving.
- Basic slot period of 913 microseconds carrying 8 OFDM symbols.
- One of the first standards to support both TDM (FL,RL) and separate-frequency (FL, RL) deployments.
Read more about this topic: IEEE802.20
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