Source: LTE/SAE Trial Initiative press release
The LTE/SAE Trial Initiative (LSTI), a unique global collaboration between vendors and operators, has successfully completed and reached the objectives of the TD-LTE (LTE TDD) Proof of Concept (PoC) Milestone 3 and Milestone 4 test phases: Demonstration that the basic LTE/SAE functionality and performance are achievable with pre-standards prototype equipment. Time-Division Duplex (TDD) is the application of time-division multiplexing that separates transmit and receive signals.
Data Rate Results
• The industry’s peak spectral efficiency target of 5 bps/Hz downlink and 2.5 bps/Hz uplink can be achieved in a live air test.
• MIMO technology working in realistic conditions, with rates of over 40 Mbps (spectral efficiency: 7.3 bps/Hz) measured in the field with a 2x2 antenna configuration.
• End user rates will vary widely depending on radio conditions and network loading. The minimum offered speed at ‘cell edge’ during busy hour is expected to be around 0.06 bps/Hz/User spectral efficiency (with ten active users per cell). This aligns with the 3GPP design target of 2-3x higher than HSDPA.
• LTE/SAE can provide Guaranteed Bit Rates in order to support real time services such as IPTV.
• Initial results demonstrate that TD-LTE can support speeds up to 350km/h, and also 500km/h has been demonstrated in good radio conditions.
• Measured connection setup times are under the requirement of 100 milliseconds.
• One way over-the-air packets transmit times of under 5ms have been achieved with TD-LTE system.
• Round trip response times experienced by end users ‘pinging’ an internet server meet the 3GPP and industry targets.
• Tests in ideal lab conditions have demonstrated that TD-LTE is capable of supporting VoIP with minimal latency, jitter and packet loss.
• Mobility testing in the field has shown that data flow interruption times during handovers are meeting the NGMN ‘real time service’ requirement even in high definition video conferencing usage scenarios.