30 Sep '14, 3pm

Why Mobile Voice Quality Still Stinks—and How to Fix It

The IMS prioritizes some types of traffic over others by assigning each data connection a single-digit code, called the QoS (quality-of-service) class identifier, or QCI. This number, which is stored in a routing table, describes the transmission requirements for the link, including the maximum packet latency, acceptable number of losses, and whether the network will guarantee a given bit rate. Voice calls, for example, get a QCI of 1, which ensures that 99.99 percent of packets will arrive at their destination within 100 milliseconds, even during peak use times. By comparison, typical Internet traffic, such as e-mail and browsing data, receives the lowest-priority QCIs: 8 and 9. Each router along the way can now usher packets into different transmission queues depending on their QCIs, preventing VoLTE packets, for example, from getting stuck in a Netflix traffic jam.

Full article: http://spectrum.ieee.org/telecom/wireless/why-mobile-voic...

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