Why Latency Matters to Mobile Backhaul - O3b Networks

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Why Latency Matters to Mobile Backhaul Data services are projected to grow by a staggering 78% annually over just the next four years. It is also clear that the mix of applications is changing, particularly with the shift towards mobile video. While the increasing data rates and the changing application mix are easily understood, the impact of latency on performance requires a closer look. How does latency affect application quality and the end user experience We will explain the significant difference lower latency can make in the delivery of voice, video and data services. We will strive to answer the question: Why does latency matter to mobile backhaul QoE is the new challenge Fierce market competition is driving network operators to identify true differentiators capable of separating them from the rest. The innovators, in turn, are intensifying efforts to boost the Quality of Experience for their subscribers. As a result, QoE is now one of the latest buzzwords in the mobile industry. The QoE experienced by a mobile subscriber for a voice call is influenced by a number of factors, including mouth-to-ear delay, voice call set-up delay and audio quality/noise. The QoE for data services is influenced by web page response time and download speeds. Network segment QoS indicators For mobile network elements, such as components of the access, backhaul and core networks, several indicators are used to define and monitor the target performance. − Latency - Latency is the duration of time for information to transit from one point to another point of the network. Depending on the type of service, it can be measured either in one direction (Ear-to-mouth or One-way latency) or as a round trip time (RTT or Two-way latency). − Jitter - Jitter is the variation of the measured latency. It is generated by the variation of the load on the network due to usage levels. − Packet loss - Packet loss is the ratio of packets being lost during transit from one point to another point of the network. It is generally caused by transmission errors, congestion of links, faults or the routing process. In modern IP based networks jitter is easily compensated for by implementing buffers in the endpoints. Likewise packet loss is very low on today’s networks, which employ high performance error correction codes such as LDPC which is used in DVB-S2. Latency, however, is more difficult to avoid. The root cause is linked to long distances and the speed of light. Once present in a system, latency cannot be removed. This is exactly why the mobile industry has consistently engineered each new technology generation with lower latency, as seen in Figure 2. www.o3bnetworks.com 4
Why Latency Matters to Mobile Backhaul Figure 2 – Latency in Mobile Technology Evolution Every new mobile technology generation has reduced network latency. The right side of the chart shows the latency of satellite backhaul for traditional GEO satellite and O3b’s MEO constellation. It is easy to see that for later generation mobile networks satellite backhaul is the dominant contributor to end-to-end latency and the resulting subscriber QoE. www.o3bnetworks.com 5
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Why Latency Matters to Mobile Backhaul - O3b Networks

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