LTE/SAE Trial Initiative (LSTI)

LTE/SAE Trial Initiative (LSTI)

February 19, 2009 02:00 ET

LSTI Testing Demonstrates the Mobile Broadband Capabilities of LTE Under Real World Conditions

LSTI Test Results Help Operators to form Realistic Deployment Plans for LTE

LONDON, UNITED KINGDOM--(Marketwire - Feb. 19, 2009) - LTE SAE Trial Initiative (LSTI), a global group of Long Term Evolution (LTE) equipment vendors and operators, have completed their Proof of Concept (PoC) test phase, demonstrating that the benefits of LTE/SAE in terms of performance and functionality are achievable in real world live-air networks. LSTI measurements are revealing what end users will be able to experience in the real world.

LTE is expected to deliver a new era of mobile broadband services in which consumers will be able to access Internet applications on their mobile devices with enhanced speed and responsiveness compared to today's systems. Over 80 contributions measuring things like VoIP performance over LTE, the download speeds that end users can expect, and how well LTE supports mobility were gathered from 8 vendors. Their measurements have been consolidated by the LSTI operators and vendors to determine the ability of LTE to bring this enhanced user experience to consumers; and to help operators understand how the technology will function in realistic scenarios.

"Early lab tests showing peak data rates in excess of 300 Mbps indicate what LTE can deliver theoretically, but operators need to deploy in the real world," said Alain Maloberti, VP, Network Architecture and Design, Orange, LSTI member. "Understanding how LTE works when many people are sharing the network or as users access the network from the cell edge is integral to determining how operators will set up their networks as well as how much they may cost. Operators want LTE to allow high cell average throughputs to increase the capacity of their mobile broadband networks. LSTI is presently working to produce figures relevant to these domains. This will help operators define realistic business plans for LTE networks."

LSTI testing has shown the performance that operators will be able to offer to LTE users in real world conditions. Results demonstrate that:

- End user performance in the real world will vary depending on radio conditions and the amount of traffic on the network. However, even during 'busy hours' when the network is congested, mobile LTE users can expect to receive enough bandwidth to run applications like streaming video. LSTI measurements align with the 3GPP requirement to be 2-3x higher than HSDPA.

- The time it takes for data to make a round trip between an LTE user and an Internet server is around 25ms. This low latency level is important for enhancing the experience of interactive applications like VoIP, gaming, and virtual worlds.

- LTE can be used to deliver real time services, like VoIP and IPTV, that require consistent data rates and fast response times for optimal performance with guaranteed quality of service.

- Fast handovers between LTE cell sites have been achieved at speeds of over 100km/h, this means that an end user will not see interruption in their connectivity even if they are traveling in a vehicle at highway speeds. When this was demonstrated in the field to operator members of LSTI they saw no perceivable interruption to their HD video conference when handover occurred.

These results build upon LSTI's earlier work which concluded that it is feasible to make LTE/SAE equipment that can meet industry expectations. Both the FDD and TDD variants have been tested, and meet the following targets:

- The required 100Mbps (5bps/Hz for TD-LTE) download and 50Mbps (2.5bps/Hz for TD-LTE) upload can be achieved with a single user in the cell in excellent radio conditions.

- Radio latency under 10ms is achievable.

Early PoC measurements were performed on the laboratory bench with simulated radio links. Now, vendors are doing live-air field testing with multiple cells and seamless handovers. The industry is approaching the start of the Friendly Customer Trials phase, using commercial platforms and realistic user terminals. These trials will be running from the second half of 2009, and the LSTI will be reporting on their progress.

The LSTI Proof of Concept activity tests how real LTE implementations measure up against theoretical expectations. Julius Robson of Nortel, Chairman of the Proof of Concept group, will present these results at Mobile World Congress in Barcelona on Thursday, February 19 as part of the 'Technology Evolution Stream'.

LSTI's efforts to accelerate development of the LTE technology and ecosystem have recently been enhanced by the addition of several new members to the trial initiative. The latest companies to join LSTI are SFR, Panasonic, and Azimuth Systems.

About LSTI

The LTE/SAE Trial Initiative (LSTI) is a global, collaborative technology trial initiative focused on accelerating the availability of commercial and interoperable next generation LTE mobile broadband systems. The Initiative was formally launched in May 2007 by leading telecommunications companies and is now steered by Alcatel-Lucent, Ericsson, Nokia, Nokia Siemens Networks, Nortel, Orange, T-Mobile, Vodafone, China Mobile, Huawei and Samsung. Since its inception LSTI has expanded to include over 30 members, click here to see a full list of members. For more information visit

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